diff --git a/.junit.run/Not Slow.run.xml b/.junit.run/Not Slow.run.xml
new file mode 100644
index 000000000..a0e3710a9
--- /dev/null
+++ b/.junit.run/Not Slow.run.xml	
@@ -0,0 +1,17 @@
+<component name="ProjectRunConfigurationManager">
+  <configuration default="false" name="Not Slow" type="JUnit" factoryName="JUnit" singleton="false">
+    <useClassPathOnly />
+    <option name="MAIN_CLASS_NAME" value="" />
+    <option name="METHOD_NAME" value="" />
+    <option name="TEST_OBJECT" value="tags" />
+    <option name="VM_PARAMETERS" value="-ea -Djunit.jupiter.extensions.autodetection.enabled=true" />
+    <option name="PARAMETERS" value="" />
+    <option name="TEST_SEARCH_SCOPE">
+      <value defaultName="wholeProject" />
+    </option>
+    <tag value="!Slow &amp; !Slowish &amp; !Remote &amp; !Android" />
+    <method v="2">
+      <option name="Make" enabled="true" />
+    </method>
+  </configuration>
+</component>
\ No newline at end of file
diff --git a/android-test/src/androidTest/java/okhttp/android/test/OkHttpTest.kt b/android-test/src/androidTest/java/okhttp/android/test/OkHttpTest.kt
index 12621a20e..b2511439a 100644
--- a/android-test/src/androidTest/java/okhttp/android/test/OkHttpTest.kt
+++ b/android-test/src/androidTest/java/okhttp/android/test/OkHttpTest.kt
@@ -60,6 +60,7 @@ import org.junit.jupiter.api.Assertions.fail
 import org.junit.jupiter.api.Assumptions.assumeTrue
 import org.junit.jupiter.api.BeforeEach
 import org.junit.jupiter.api.Disabled
+import org.junit.jupiter.api.Tag
 import org.junit.jupiter.api.Test
 import org.junit.jupiter.api.extension.ExtendWith
 import org.junit.jupiter.api.extension.RegisterExtension
@@ -88,6 +89,7 @@ import javax.net.ssl.X509TrustManager
  * Run with "./gradlew :android-test:connectedCheck" and make sure ANDROID_SDK_ROOT is set.
  */
 @ExtendWith(MockWebServerExtension::class)
+@Tag("Slow")
 class OkHttpTest(val server: MockWebServer) {
   @Suppress("RedundantVisibilityModifier")
   @JvmField
diff --git a/android-test/src/androidTest/java/okhttp/android/test/letsencrypt/LetsEncryptClientTest.kt b/android-test/src/androidTest/java/okhttp/android/test/letsencrypt/LetsEncryptClientTest.kt
index 5e6e72557..b2cd95264 100644
--- a/android-test/src/androidTest/java/okhttp/android/test/letsencrypt/LetsEncryptClientTest.kt
+++ b/android-test/src/androidTest/java/okhttp/android/test/letsencrypt/LetsEncryptClientTest.kt
@@ -22,12 +22,14 @@ import okhttp3.Request
 import okhttp3.tls.HandshakeCertificates
 import okhttp3.tls.decodeCertificatePem
 import org.assertj.core.api.Assertions.assertThat
+import org.junit.jupiter.api.Tag
 import org.junit.jupiter.api.Test
 import java.security.cert.X509Certificate
 
 /**
  * Test for new Let's Encrypt Root Certificate.
  */
+@Tag("Remote")
 class LetsEncryptClientTest {
   @Test fun get() {
     // These tests wont actually run before Android 8.0 as per
diff --git a/mockwebserver-deprecated/src/test/java/okhttp3/mockwebserver/MockWebServerTest.java b/mockwebserver-deprecated/src/test/java/okhttp3/mockwebserver/MockWebServerTest.java
index c9fefe8ed..c43feeb5f 100644
--- a/mockwebserver-deprecated/src/test/java/okhttp3/mockwebserver/MockWebServerTest.java
+++ b/mockwebserver-deprecated/src/test/java/okhttp3/mockwebserver/MockWebServerTest.java
@@ -44,6 +44,7 @@ import okhttp3.tls.HeldCertificate;
 import org.junit.jupiter.api.AfterEach;
 import org.junit.jupiter.api.BeforeEach;
 import org.junit.jupiter.api.Disabled;
+import org.junit.jupiter.api.Tag;
 import org.junit.jupiter.api.Test;
 import org.junit.jupiter.api.Timeout;
 import org.junit.jupiter.api.extension.RegisterExtension;
@@ -63,6 +64,7 @@ import static org.junit.Assume.assumeFalse;
 
 @SuppressWarnings({"ArraysAsListWithZeroOrOneArgument", "deprecation"})
 @Timeout(30)
+@Tag("Slow")
 public final class MockWebServerTest {
   @RegisterExtension public PlatformRule platform = new PlatformRule();
 
diff --git a/mockwebserver/src/test/java/mockwebserver3/MockWebServerTest.java b/mockwebserver/src/test/java/mockwebserver3/MockWebServerTest.java
index aaa534f9f..1d5e5497a 100644
--- a/mockwebserver/src/test/java/mockwebserver3/MockWebServerTest.java
+++ b/mockwebserver/src/test/java/mockwebserver3/MockWebServerTest.java
@@ -43,6 +43,7 @@ import okhttp3.tls.HeldCertificate;
 import org.junit.jupiter.api.AfterEach;
 import org.junit.jupiter.api.BeforeEach;
 import org.junit.jupiter.api.Disabled;
+import org.junit.jupiter.api.Tag;
 import org.junit.jupiter.api.Test;
 import org.junit.jupiter.api.Timeout;
 import org.junit.jupiter.api.extension.RegisterExtension;
@@ -60,6 +61,7 @@ import static org.junit.jupiter.api.Assumptions.assumeFalse;
 
 @SuppressWarnings({"ArraysAsListWithZeroOrOneArgument", "deprecation"})
 @Timeout(30)
+@Tag("Slow")
 public final class MockWebServerTest {
   @RegisterExtension public PlatformRule platform = new PlatformRule();
 
diff --git a/native-image-tests/src/main/kotlin/okhttp3/SampleTest.kt b/native-image-tests/src/main/kotlin/okhttp3/SampleTest.kt
index 96d68c2cf..39c11a32c 100644
--- a/native-image-tests/src/main/kotlin/okhttp3/SampleTest.kt
+++ b/native-image-tests/src/main/kotlin/okhttp3/SampleTest.kt
@@ -28,8 +28,8 @@ class SampleTest {
   @JvmField @RegisterExtension val clientRule = OkHttpClientTestRule()
 
   @Test
-  fun failingTest() {
-    assertThat("hello").isEqualTo("goodbye")
+  fun passingTest() {
+    assertThat("hello").isEqualTo("hello")
   }
 
   @Test
diff --git a/okhttp-dnsoverhttps/src/test/java/okhttp3/dnsoverhttps/DnsOverHttpsTest.java b/okhttp-dnsoverhttps/src/test/java/okhttp3/dnsoverhttps/DnsOverHttpsTest.java
index 5d5c56b6b..4be9eba82 100644
--- a/okhttp-dnsoverhttps/src/test/java/okhttp3/dnsoverhttps/DnsOverHttpsTest.java
+++ b/okhttp-dnsoverhttps/src/test/java/okhttp3/dnsoverhttps/DnsOverHttpsTest.java
@@ -36,6 +36,7 @@ import okhttp3.testing.PlatformRule;
 import okio.Buffer;
 import okio.ByteString;
 import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Tag;
 import org.junit.jupiter.api.Test;
 import org.junit.jupiter.api.extension.ExtendWith;
 import org.junit.jupiter.api.extension.RegisterExtension;
@@ -46,6 +47,7 @@ import static org.assertj.core.api.Assertions.assertThat;
 import static org.junit.jupiter.api.Assertions.fail;
 
 @ExtendWith(MockWebServerExtension.class)
+@Tag("Slowish")
 public class DnsOverHttpsTest {
   @RegisterExtension public final PlatformRule platform = new PlatformRule();
 
diff --git a/okhttp-sse/src/test/java/okhttp3/sse/internal/EventSourceHttpTest.java b/okhttp-sse/src/test/java/okhttp3/sse/internal/EventSourceHttpTest.java
index aff634e42..24ec9f93b 100644
--- a/okhttp-sse/src/test/java/okhttp3/sse/internal/EventSourceHttpTest.java
+++ b/okhttp-sse/src/test/java/okhttp3/sse/internal/EventSourceHttpTest.java
@@ -28,6 +28,7 @@ import okhttp3.sse.EventSources;
 import okhttp3.testing.PlatformRule;
 import org.junit.jupiter.api.AfterEach;
 import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Tag;
 import org.junit.jupiter.api.Test;
 import org.junit.jupiter.api.extension.ExtendWith;
 import org.junit.jupiter.api.extension.RegisterExtension;
@@ -35,6 +36,7 @@ import org.junit.jupiter.api.extension.RegisterExtension;
 import static org.assertj.core.api.Assertions.assertThat;
 
 @ExtendWith(MockWebServerExtension.class)
+@Tag("Slowish")
 public final class EventSourceHttpTest {
   @RegisterExtension public final PlatformRule platform = new PlatformRule();
 
diff --git a/okhttp/src/test/java/okhttp3/CacheTest.java b/okhttp/src/test/java/okhttp3/CacheTest.java
index cc88d3383..addeae6ca 100644
--- a/okhttp/src/test/java/okhttp3/CacheTest.java
+++ b/okhttp/src/test/java/okhttp3/CacheTest.java
@@ -49,6 +49,7 @@ import okio.GzipSink;
 import okio.Okio;
 import org.junit.jupiter.api.AfterEach;
 import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Tag;
 import org.junit.jupiter.api.Test;
 import org.junit.jupiter.api.extension.RegisterExtension;
 
@@ -59,6 +60,7 @@ import static org.assertj.core.api.Assertions.assertThat;
 import static org.assertj.core.data.Offset.offset;
 import static org.junit.jupiter.api.Assertions.fail;
 
+@Tag("Slow")
 public final class CacheTest {
   private static final HostnameVerifier NULL_HOSTNAME_VERIFIER = (name, session) -> true;
 
diff --git a/okhttp/src/test/java/okhttp3/CallTest.java b/okhttp/src/test/java/okhttp3/CallTest.java
index aff2965b7..171e7255d 100644
--- a/okhttp/src/test/java/okhttp3/CallTest.java
+++ b/okhttp/src/test/java/okhttp3/CallTest.java
@@ -83,6 +83,7 @@ import okio.Okio;
 import org.junit.jupiter.api.AfterEach;
 import org.junit.jupiter.api.BeforeEach;
 import org.junit.jupiter.api.Disabled;
+import org.junit.jupiter.api.Tag;
 import org.junit.jupiter.api.Test;
 import org.junit.jupiter.api.Timeout;
 import org.junit.jupiter.api.extension.RegisterExtension;
@@ -2215,6 +2216,7 @@ public final class CallTest {
     assertThat(server.takeRequest().getSequenceNumber()).isEqualTo(2);
   }
 
+  @Tag("Slow")
   @Test public void follow20Redirects() throws Exception {
     for (int i = 0; i < 20; i++) {
       server.enqueue(new MockResponse()
@@ -2229,6 +2231,7 @@ public final class CallTest {
         .assertBody("Success!");
   }
 
+  @Tag("Slow")
   @Test public void follow20Redirects_Async() throws Exception {
     for (int i = 0; i < 20; i++) {
       server.enqueue(new MockResponse()
@@ -2245,6 +2248,7 @@ public final class CallTest {
         .assertBody("Success!");
   }
 
+  @Tag("Slow")
   @Test public void doesNotFollow21Redirects() throws Exception {
     for (int i = 0; i < 21; i++) {
       server.enqueue(new MockResponse()
@@ -2261,6 +2265,7 @@ public final class CallTest {
     }
   }
 
+  @Tag("Slow")
   @Test public void doesNotFollow21Redirects_Async() throws Exception {
     for (int i = 0; i < 21; i++) {
       server.enqueue(new MockResponse()
@@ -2323,10 +2328,12 @@ public final class CallTest {
     assertThat(server.getRequestCount()).isEqualTo(0);
   }
 
+  @Tag("Slowish")
   @Test public void cancelDuringHttpConnect() throws Exception {
     cancelDuringConnect("http");
   }
 
+  @Tag("Slowish")
   @Test public void cancelDuringHttpsConnect() throws Exception {
     cancelDuringConnect("https");
   }
@@ -2768,6 +2775,7 @@ public final class CallTest {
     expect100ContinueEmptyRequestBody();
   }
 
+  @Tag("Slowish")
   @Test public void expect100ContinueTimesOutWithoutContinue() throws Exception {
     server.enqueue(new MockResponse()
         .setSocketPolicy(SocketPolicy.NO_RESPONSE));
@@ -2793,6 +2801,7 @@ public final class CallTest {
     assertThat(recordedRequest.getBody().readUtf8()).isEqualTo("");
   }
 
+  @Tag("Slowish")
   @Test public void expect100ContinueTimesOutWithoutContinue_HTTP2() throws Exception {
     enableProtocol(Protocol.HTTP_2);
     expect100ContinueTimesOutWithoutContinue();
@@ -2820,6 +2829,7 @@ public final class CallTest {
     serverRespondsWithUnsolicited100Continue();
   }
 
+  @Tag("Slow")
   @Test public void serverRespondsWith100ContinueOnly() throws Exception {
     client = client.newBuilder()
         .readTimeout(Duration.ofSeconds(1))
@@ -2844,6 +2854,7 @@ public final class CallTest {
     assertThat(recordedRequest.getBody().readUtf8()).isEqualTo("abc");
   }
 
+  @Tag("Slow")
   @Test public void serverRespondsWith100ContinueOnly_HTTP2() throws Exception {
     enableProtocol(Protocol.HTTP_2);
     serverRespondsWith100ContinueOnly();
@@ -2867,11 +2878,13 @@ public final class CallTest {
     assertThat(server.takeRequest().getSequenceNumber()).isEqualTo(1);
   }
 
+  @Tag("Slow")
   @Test public void successfulExpectContinuePermitsConnectionReuseWithHttp2() throws Exception {
     enableProtocol(Protocol.HTTP_2);
     successfulExpectContinuePermitsConnectionReuse();
   }
 
+  @Tag("Slow")
   @Test public void unsuccessfulExpectContinuePreventsConnectionReuse() throws Exception {
     server.enqueue(new MockResponse());
     server.enqueue(new MockResponse());
@@ -3604,6 +3617,7 @@ public final class CallTest {
         + " Did you forget to close a response body?");
   }
 
+  @Tag("Slowish")
   @Test public void asyncLeakedResponseBodyLogsStackTrace() throws Exception {
     server.enqueue(new MockResponse()
         .setBody("This gets leaked."));
diff --git a/okhttp/src/test/java/okhttp3/ConnectionCoalescingTest.java b/okhttp/src/test/java/okhttp3/ConnectionCoalescingTest.java
index caec25046..5557bae3c 100644
--- a/okhttp/src/test/java/okhttp3/ConnectionCoalescingTest.java
+++ b/okhttp/src/test/java/okhttp3/ConnectionCoalescingTest.java
@@ -34,6 +34,7 @@ import okhttp3.testing.PlatformRule;
 import okhttp3.tls.HandshakeCertificates;
 import okhttp3.tls.HeldCertificate;
 import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Tag;
 import org.junit.jupiter.api.Test;
 import org.junit.jupiter.api.extension.RegisterExtension;
 
@@ -41,6 +42,7 @@ import static java.util.Arrays.asList;
 import static org.assertj.core.api.Assertions.assertThat;
 import static org.junit.jupiter.api.Assertions.fail;
 
+@Tag("Slowish")
 public final class ConnectionCoalescingTest {
   @RegisterExtension public final PlatformRule platform = new PlatformRule();
   @RegisterExtension public final OkHttpClientTestRule clientTestRule = new OkHttpClientTestRule();
diff --git a/okhttp/src/test/java/okhttp3/ConnectionReuseTest.java b/okhttp/src/test/java/okhttp3/ConnectionReuseTest.java
index 1797ad554..82e0b28c8 100644
--- a/okhttp/src/test/java/okhttp3/ConnectionReuseTest.java
+++ b/okhttp/src/test/java/okhttp3/ConnectionReuseTest.java
@@ -25,6 +25,7 @@ import mockwebserver3.SocketPolicy;
 import okhttp3.testing.PlatformRule;
 import okhttp3.tls.HandshakeCertificates;
 import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Tag;
 import org.junit.jupiter.api.Test;
 import org.junit.jupiter.api.Timeout;
 import org.junit.jupiter.api.extension.RegisterExtension;
@@ -36,6 +37,7 @@ import static org.assertj.core.api.Assertions.assertThat;
 import static org.junit.jupiter.api.Assertions.fail;
 
 @Timeout(30)
+@Tag("Slowish")
 public final class ConnectionReuseTest {
   @RegisterExtension public final PlatformRule platform = new PlatformRule();
   @RegisterExtension public final OkHttpClientTestRule clientTestRule = new OkHttpClientTestRule();
diff --git a/okhttp/src/test/java/okhttp3/DispatcherTest.java b/okhttp/src/test/java/okhttp3/DispatcherTest.java
index f9d0003f0..ed380c859 100644
--- a/okhttp/src/test/java/okhttp3/DispatcherTest.java
+++ b/okhttp/src/test/java/okhttp3/DispatcherTest.java
@@ -5,6 +5,7 @@ import java.io.InterruptedIOException;
 import java.util.concurrent.CountDownLatch;
 import java.util.concurrent.atomic.AtomicBoolean;
 import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Tag;
 import org.junit.jupiter.api.Test;
 import org.junit.jupiter.api.extension.RegisterExtension;
 
@@ -12,6 +13,7 @@ import static java.util.concurrent.TimeUnit.SECONDS;
 import static org.assertj.core.api.Assertions.assertThat;
 import static org.junit.jupiter.api.Assertions.fail;
 
+@Tag("Slowish")
 public final class DispatcherTest {
   @RegisterExtension public final OkHttpClientTestRule clientTestRule = new OkHttpClientTestRule();
 
diff --git a/okhttp/src/test/java/okhttp3/DuplexTest.java b/okhttp/src/test/java/okhttp3/DuplexTest.java
index d685ea15e..64b094bbd 100644
--- a/okhttp/src/test/java/okhttp3/DuplexTest.java
+++ b/okhttp/src/test/java/okhttp3/DuplexTest.java
@@ -37,6 +37,7 @@ import okio.BufferedSource;
 import org.jetbrains.annotations.Nullable;
 import org.junit.jupiter.api.BeforeEach;
 import org.junit.jupiter.api.Disabled;
+import org.junit.jupiter.api.Tag;
 import org.junit.jupiter.api.Test;
 import org.junit.jupiter.api.Timeout;
 import org.junit.jupiter.api.extension.RegisterExtension;
@@ -48,6 +49,7 @@ import static org.assertj.core.api.Assertions.assertThat;
 import static org.junit.jupiter.api.Assertions.fail;
 
 @Timeout(30)
+@Tag("Slowish")
 public final class DuplexTest {
   @RegisterExtension public final PlatformRule platform = new PlatformRule();
   @RegisterExtension public OkHttpClientTestRule clientTestRule = new OkHttpClientTestRule();
diff --git a/okhttp/src/test/java/okhttp3/EventListenerTest.java b/okhttp/src/test/java/okhttp3/EventListenerTest.java
index c9eb67203..a7ba75b83 100644
--- a/okhttp/src/test/java/okhttp3/EventListenerTest.java
+++ b/okhttp/src/test/java/okhttp3/EventListenerTest.java
@@ -69,6 +69,7 @@ import org.hamcrest.Matcher;
 import org.junit.Assert;
 import org.junit.jupiter.api.AfterEach;
 import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Tag;
 import org.junit.jupiter.api.Test;
 import org.junit.jupiter.api.Timeout;
 import org.junit.jupiter.api.extension.RegisterExtension;
@@ -83,6 +84,7 @@ import static org.junit.Assume.assumeThat;
 
 @Flaky // STDOUT logging enabled for test
 @Timeout(30)
+@Tag("Slow")
 public final class EventListenerTest {
   public static final Matcher<Response> anyResponse = CoreMatchers.any(Response.class);
 
diff --git a/okhttp/src/test/java/okhttp3/InterceptorTest.java b/okhttp/src/test/java/okhttp3/InterceptorTest.java
index f8df3e03d..599370f7f 100644
--- a/okhttp/src/test/java/okhttp3/InterceptorTest.java
+++ b/okhttp/src/test/java/okhttp3/InterceptorTest.java
@@ -41,12 +41,14 @@ import okio.Okio;
 import okio.Sink;
 import okio.Source;
 import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Tag;
 import org.junit.jupiter.api.Test;
 import org.junit.jupiter.api.extension.RegisterExtension;
 
 import static org.assertj.core.api.Assertions.assertThat;
 import static org.junit.jupiter.api.Assertions.fail;
 
+@Tag("Slow")
 public final class InterceptorTest {
   @RegisterExtension public final OkHttpClientTestRule clientTestRule = new OkHttpClientTestRule();
 
diff --git a/okhttp/src/test/java/okhttp3/KotlinSourceModernTest.kt b/okhttp/src/test/java/okhttp3/KotlinSourceModernTest.kt
index 1da7ead64..40e3f1ca6 100644
--- a/okhttp/src/test/java/okhttp3/KotlinSourceModernTest.kt
+++ b/okhttp/src/test/java/okhttp3/KotlinSourceModernTest.kt
@@ -76,6 +76,8 @@ import okio.BufferedSink
 import okio.BufferedSource
 import okio.ByteString
 import okio.Timeout
+import org.junit.jupiter.api.Assumptions.assumeFalse
+import org.junit.jupiter.api.BeforeEach
 import org.junit.jupiter.api.Disabled
 import org.junit.jupiter.api.Test
 
@@ -95,6 +97,11 @@ import org.junit.jupiter.api.Test
 )
 @Disabled
 class KotlinSourceModernTest {
+  @BeforeEach
+  fun disabled() {
+    assumeFalse(true)
+  }
+
   @Test
   fun address() {
     val address: Address = newAddress()
diff --git a/okhttp/src/test/java/okhttp3/MultipartReaderTest.kt b/okhttp/src/test/java/okhttp3/MultipartReaderTest.kt
index 383185924..94d2ee525 100644
--- a/okhttp/src/test/java/okhttp3/MultipartReaderTest.kt
+++ b/okhttp/src/test/java/okhttp3/MultipartReaderTest.kt
@@ -15,8 +15,6 @@
  */
 package okhttp3
 
-import java.io.EOFException
-import java.net.ProtocolException
 import okhttp3.Headers.Companion.headersOf
 import okhttp3.MediaType.Companion.toMediaType
 import okhttp3.RequestBody.Companion.toRequestBody
@@ -24,8 +22,12 @@ import okhttp3.ResponseBody.Companion.toResponseBody
 import okio.Buffer
 import org.assertj.core.api.Assertions.assertThat
 import org.junit.jupiter.api.Assertions.fail
+import org.junit.jupiter.api.Tag
 import org.junit.jupiter.api.Test
+import java.io.EOFException
+import java.net.ProtocolException
 
+@Tag("Slowish")
 class MultipartReaderTest {
   @Test fun `parse multipart`() {
     val multipart = """
@@ -47,23 +49,27 @@ class MultipartReaderTest {
         .replace("\n", "\r\n")
 
     val parts = MultipartReader(
-        boundary = "simple boundary",
-        source = Buffer().writeUtf8(multipart)
+      boundary = "simple boundary",
+      source = Buffer().writeUtf8(multipart)
     )
     assertThat(parts.boundary).isEqualTo("simple boundary")
 
     val partAbc = parts.nextPart()!!
-    assertThat(partAbc.headers).isEqualTo(headersOf(
+    assertThat(partAbc.headers).isEqualTo(
+      headersOf(
         "Content-Type", "text/plain; charset=utf-8",
         "Content-ID", "abc"
-    ))
+      )
+    )
     assertThat(partAbc.body.readUtf8()).isEqualTo("abcd\r\nefgh")
 
     val partIjk = parts.nextPart()!!
-    assertThat(partIjk.headers).isEqualTo(headersOf(
+    assertThat(partIjk.headers).isEqualTo(
+      headersOf(
         "Content-Type", "text/plain; charset=utf-8",
         "Content-ID", "ijk"
-    ))
+      )
+    )
     assertThat(partIjk.body.readUtf8()).isEqualTo("ijkl\r\nmnop\r\n")
 
     assertThat(parts.nextPart()).isNull()
@@ -79,7 +85,8 @@ class MultipartReaderTest {
         .replace("\n", "\r\n")
 
     val responseBody = multipart.toResponseBody(
-        "application/multipart; boundary=\"simple boundary\"".toMediaType())
+      "application/multipart; boundary=\"simple boundary\"".toMediaType()
+    )
 
     val parts = MultipartReader(responseBody)
     assertThat(parts.boundary).isEqualTo("simple boundary")
@@ -100,8 +107,8 @@ class MultipartReaderTest {
         .replace("\n", "\r\n")
 
     val parts = MultipartReader(
-        boundary = "simple boundary",
-        source = Buffer().writeUtf8(multipart)
+      boundary = "simple boundary",
+      source = Buffer().writeUtf8(multipart)
     )
 
     val part = parts.nextPart()!!
@@ -126,8 +133,8 @@ class MultipartReaderTest {
         .replace("\n", "\r\n")
 
     val parts = MultipartReader(
-        boundary = "simple boundary",
-        source = Buffer().writeUtf8(multipart)
+      boundary = "simple boundary",
+      source = Buffer().writeUtf8(multipart)
     )
 
     try {
@@ -151,8 +158,8 @@ class MultipartReaderTest {
         .replace(Regex("(?m)abcd\r\n"), "abcd\n")
 
     val parts = MultipartReader(
-        boundary = "simple boundary",
-        source = Buffer().writeUtf8(multipart)
+      boundary = "simple boundary",
+      source = Buffer().writeUtf8(multipart)
     )
 
     val part = parts.nextPart()!!
@@ -174,8 +181,8 @@ class MultipartReaderTest {
         .replace("\n", "\r\n")
 
     val parts = MultipartReader(
-        boundary = "simple boundary",
-        source = Buffer().writeUtf8(multipart)
+      boundary = "simple boundary",
+      source = Buffer().writeUtf8(multipart)
     )
 
     val part = parts.nextPart()!!
@@ -199,8 +206,8 @@ class MultipartReaderTest {
         .replace("\n", "\r\n")
 
     val parts = MultipartReader(
-        boundary = "simple boundary",
-        source = Buffer().writeUtf8(multipart)
+      boundary = "simple boundary",
+      source = Buffer().writeUtf8(multipart)
     )
 
     parts.nextPart()!!
@@ -225,8 +232,8 @@ class MultipartReaderTest {
         .replace("\n", "\r\n")
 
     val parts = MultipartReader(
-        boundary = "simple boundary",
-        source = Buffer().writeUtf8(multipart)
+      boundary = "simple boundary",
+      source = Buffer().writeUtf8(multipart)
     )
 
     val partAbc = parts.nextPart()!!
@@ -253,8 +260,8 @@ class MultipartReaderTest {
         .replace("\n", "\r\n")
 
     val parts = MultipartReader(
-        boundary = "simple boundary",
-        source = Buffer().writeUtf8(multipart)
+      boundary = "simple boundary",
+      source = Buffer().writeUtf8(multipart)
     )
 
     val part = parts.nextPart()!!
@@ -270,8 +277,8 @@ class MultipartReaderTest {
 
   @Test fun `cannot call nextPart after calling close`() {
     val parts = MultipartReader(
-        boundary = "simple boundary",
-        source = Buffer()
+      boundary = "simple boundary",
+      source = Buffer()
     )
 
     parts.close()
@@ -291,8 +298,8 @@ class MultipartReaderTest {
         .replace("\n", "\r\n")
 
     val parts = MultipartReader(
-        boundary = "simple boundary",
-        source = Buffer().writeUtf8(multipart)
+      boundary = "simple boundary",
+      source = Buffer().writeUtf8(multipart)
     )
 
     try {
@@ -315,8 +322,8 @@ class MultipartReaderTest {
         .replace("\n", "\r\n")
 
     val parts = MultipartReader(
-        boundary = "simple boundary",
-        source = Buffer().writeUtf8(multipart)
+      boundary = "simple boundary",
+      source = Buffer().writeUtf8(multipart)
     )
 
     val part = parts.nextPart()!!
@@ -337,8 +344,8 @@ class MultipartReaderTest {
         .replace("\n", "\r\n")
 
     val parts = MultipartReader(
-        boundary = "simple boundary",
-        source = Buffer().writeUtf8(multipart)
+      boundary = "simple boundary",
+      source = Buffer().writeUtf8(multipart)
     )
 
     val part = parts.nextPart()!!
@@ -359,8 +366,8 @@ class MultipartReaderTest {
         .replace("\n", "\r\n")
 
     val parts = MultipartReader(
-        boundary = "simple boundary",
-        source = Buffer().writeUtf8(multipart)
+      boundary = "simple boundary",
+      source = Buffer().writeUtf8(multipart)
     )
 
     val part = parts.nextPart()!!
@@ -381,8 +388,8 @@ class MultipartReaderTest {
         .replace("\n", "\r\n")
 
     val parts = MultipartReader(
-        boundary = "simple boundary",
-        source = Buffer().writeUtf8(multipart)
+      boundary = "simple boundary",
+      source = Buffer().writeUtf8(multipart)
     )
 
     val part = parts.nextPart()!!
@@ -400,8 +407,8 @@ class MultipartReaderTest {
         .replace("\n", "\r\n")
 
     val parts = MultipartReader(
-        boundary = "simple boundary",
-        source = Buffer().writeUtf8(multipart)
+      boundary = "simple boundary",
+      source = Buffer().writeUtf8(multipart)
     )
 
     try {
@@ -422,8 +429,8 @@ class MultipartReaderTest {
         .replace("\n", "\r\n")
 
     val parts = MultipartReader(
-        boundary = "simple boundary",
-        source = Buffer().writeUtf8(multipart)
+      boundary = "simple boundary",
+      source = Buffer().writeUtf8(multipart)
     )
 
     parts.nextPart()
@@ -451,8 +458,8 @@ class MultipartReaderTest {
         .replace("\n", "\r\n")
 
     val parts = MultipartReader(
-        boundary = "-",
-        source = Buffer().writeUtf8(multipart)
+      boundary = "-",
+      source = Buffer().writeUtf8(multipart)
     )
 
     val partAbc = parts.nextPart()!!
@@ -479,8 +486,8 @@ class MultipartReaderTest {
         .replace("\n", "\r\n")
 
     val parts = MultipartReader(
-        boundary = "simple boundary",
-        source = Buffer().writeUtf8(multipart)
+      boundary = "simple boundary",
+      source = Buffer().writeUtf8(multipart)
     )
 
     assertThat(parts.nextPart()).isNotNull()
@@ -490,8 +497,8 @@ class MultipartReaderTest {
 
   @Test fun `empty source`() {
     val parts = MultipartReader(
-        boundary = "simple boundary",
-        source = Buffer()
+      boundary = "simple boundary",
+      source = Buffer()
     )
 
     try {
@@ -516,24 +523,30 @@ class MultipartReaderTest {
     val reader = MultipartReader(bodyContent, "boundary")
 
     val quickPart = reader.nextPart()!!
-    assertThat(quickPart.headers).isEqualTo(headersOf(
+    assertThat(quickPart.headers).isEqualTo(
+      headersOf(
         "Content-Type", "text/plain; charset=utf-8",
         "Content-Length", "5"
-    ))
+      )
+    )
     assertThat(quickPart.body.readUtf8()).isEqualTo("Quick")
 
     val brownPart = reader.nextPart()!!
-    assertThat(brownPart.headers).isEqualTo(headersOf(
+    assertThat(brownPart.headers).isEqualTo(
+      headersOf(
         "Content-Disposition", "form-data; name=\"color\"",
         "Content-Length", "5"
-    ))
+      )
+    )
     assertThat(brownPart.body.readUtf8()).isEqualTo("Brown")
 
     val foxPart = reader.nextPart()!!
-    assertThat(foxPart.headers).isEqualTo(headersOf(
+    assertThat(foxPart.headers).isEqualTo(
+      headersOf(
         "Content-Disposition", "form-data; name=\"animal\"; filename=\"fox.txt\"",
         "Content-Length", "3"
-    ))
+      )
+    )
     assertThat(foxPart.body.readUtf8()).isEqualTo("Fox")
 
     assertThat(reader.nextPart()).isNull()
diff --git a/okhttp/src/test/java/okhttp3/ServerTruncatesRequestTest.kt b/okhttp/src/test/java/okhttp3/ServerTruncatesRequestTest.kt
index 97bb5d1f1..c1bbfc324 100644
--- a/okhttp/src/test/java/okhttp3/ServerTruncatesRequestTest.kt
+++ b/okhttp/src/test/java/okhttp3/ServerTruncatesRequestTest.kt
@@ -27,12 +27,14 @@ import okio.BufferedSink
 import okio.IOException
 import org.assertj.core.api.Assertions.assertThat
 import org.junit.jupiter.api.BeforeEach
+import org.junit.jupiter.api.Tag
 import org.junit.jupiter.api.Test
 import org.junit.jupiter.api.Timeout
 import org.junit.jupiter.api.extension.RegisterExtension
 import org.junit.jupiter.api.fail
 
 @Timeout(30)
+@Tag("Slowish")
 class ServerTruncatesRequestTest(
   val server: MockWebServer
 ) {
@@ -63,14 +65,16 @@ class ServerTruncatesRequestTest(
 
   private fun serverTruncatesRequestOnLongPost(https: Boolean) {
     server.enqueue(MockResponse()
-        .setSocketPolicy(SocketPolicy.DO_NOT_READ_REQUEST_BODY)
-        .setBody("abc")
-        .apply { this.http2ErrorCode = ErrorCode.NO_ERROR.httpCode })
+      .setSocketPolicy(SocketPolicy.DO_NOT_READ_REQUEST_BODY)
+      .setBody("abc")
+      .apply { this.http2ErrorCode = ErrorCode.NO_ERROR.httpCode })
 
-    val call = client.newCall(Request.Builder()
+    val call = client.newCall(
+      Request.Builder()
         .url(server.url("/"))
         .post(SlowRequestBody)
-        .build())
+        .build()
+    )
 
     call.execute().use { response ->
       assertThat(response.body!!.string()).isEqualTo("abc")
@@ -115,16 +119,18 @@ class ServerTruncatesRequestTest(
     enableProtocol(Protocol.HTTP_2)
 
     server.enqueue(MockResponse()
-        .setSocketPolicy(SocketPolicy.DO_NOT_READ_REQUEST_BODY)
-        .setBody("abc")
-        .apply { this.http2ErrorCode = ErrorCode.NO_ERROR.httpCode })
+      .setSocketPolicy(SocketPolicy.DO_NOT_READ_REQUEST_BODY)
+      .setBody("abc")
+      .apply { this.http2ErrorCode = ErrorCode.NO_ERROR.httpCode })
 
     val requestBody = AsyncRequestBody()
 
-    val call = client.newCall(Request.Builder()
+    val call = client.newCall(
+      Request.Builder()
         .url(server.url("/"))
         .post(requestBody)
-        .build())
+        .build()
+    )
 
     call.execute().use { response ->
       assertThat(response.body!!.string()).isEqualTo("abc")
@@ -171,10 +177,12 @@ class ServerTruncatesRequestTest(
 
     server.enqueue(mockResponse)
 
-    val call = client.newCall(Request.Builder()
+    val call = client.newCall(
+      Request.Builder()
         .url(server.url("/"))
         .post(SlowRequestBody)
-        .build())
+        .build()
+    )
 
     call.execute().use { response ->
       assertThat(response.body!!.string()).isEqualTo("abc")
@@ -193,10 +201,12 @@ class ServerTruncatesRequestTest(
       }
     }
 
-    val callA = client.newCall(Request.Builder()
+    val callA = client.newCall(
+      Request.Builder()
         .url(server.url("/"))
         .post(requestBody)
-        .build())
+        .build()
+    )
 
     try {
       callA.execute()
@@ -209,9 +219,11 @@ class ServerTruncatesRequestTest(
 
     // Confirm that the connection pool was not corrupted by making another call. This doesn't use
     // makeSimpleCall() because it uses the MockResponse enqueued above.
-    val callB = client.newCall(Request.Builder()
+    val callB = client.newCall(
+      Request.Builder()
         .url(server.url("/"))
-        .build())
+        .build()
+    )
     callB.execute().use { response ->
       assertThat(response.body!!.string()).isEqualTo("abc")
     }
@@ -219,9 +231,11 @@ class ServerTruncatesRequestTest(
 
   private fun makeSimpleCall() {
     server.enqueue(MockResponse().setBody("healthy"))
-    val callB = client.newCall(Request.Builder()
+    val callB = client.newCall(
+      Request.Builder()
         .url(server.url("/"))
-        .build())
+        .build()
+    )
     callB.execute().use { response ->
       assertThat(response.body!!.string()).isEqualTo("healthy")
     }
@@ -238,8 +252,8 @@ class ServerTruncatesRequestTest(
   private fun enableTls() {
     client = client.newBuilder()
         .sslSocketFactory(
-            handshakeCertificates.sslSocketFactory(),
-            handshakeCertificates.trustManager
+          handshakeCertificates.sslSocketFactory(),
+          handshakeCertificates.trustManager
         )
         .hostnameVerifier(RecordingHostnameVerifier())
         .build()
diff --git a/okhttp/src/test/java/okhttp3/URLConnectionTest.java b/okhttp/src/test/java/okhttp3/URLConnectionTest.java
index e0276f93a..2e2b2898c 100644
--- a/okhttp/src/test/java/okhttp3/URLConnectionTest.java
+++ b/okhttp/src/test/java/okhttp3/URLConnectionTest.java
@@ -81,6 +81,7 @@ import okio.Utf8;
 import org.junit.jupiter.api.AfterEach;
 import org.junit.jupiter.api.BeforeEach;
 import org.junit.jupiter.api.Disabled;
+import org.junit.jupiter.api.Tag;
 import org.junit.jupiter.api.Test;
 import org.junit.jupiter.api.extension.RegisterExtension;
 import org.junit.jupiter.api.io.TempDir;
@@ -110,6 +111,7 @@ import static org.assertj.core.api.Assertions.assertThat;
 import static org.junit.jupiter.api.Assertions.fail;
 
 /** Android's URLConnectionTest, ported to exercise OkHttp's Call API. */
+@Tag("Slow")
 public final class URLConnectionTest {
   @RegisterExtension public final PlatformRule platform = new PlatformRule();
   @RegisterExtension public final OkHttpClientTestRule clientTestRule = new OkHttpClientTestRule();
diff --git a/okhttp/src/test/java/okhttp3/WholeOperationTimeoutTest.java b/okhttp/src/test/java/okhttp3/WholeOperationTimeoutTest.java
index db8b1a5aa..69a813e4d 100644
--- a/okhttp/src/test/java/okhttp3/WholeOperationTimeoutTest.java
+++ b/okhttp/src/test/java/okhttp3/WholeOperationTimeoutTest.java
@@ -27,6 +27,7 @@ import mockwebserver3.MockWebServer;
 import okhttp3.testing.Flaky;
 import okio.BufferedSink;
 import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Tag;
 import org.junit.jupiter.api.Test;
 import org.junit.jupiter.api.Timeout;
 import org.junit.jupiter.api.extension.RegisterExtension;
@@ -35,6 +36,7 @@ import static org.assertj.core.api.Assertions.assertThat;
 import static org.junit.jupiter.api.Assertions.fail;
 
 @Timeout(30)
+@Tag("Slow")
 public final class WholeOperationTimeoutTest {
   /** A large response body. Smaller bodies might successfully read after the socket is closed! */
   private static final String BIG_ENOUGH_BODY = TestUtil.repeat('a', 64 * 1024);
diff --git a/okhttp/src/test/java/okhttp3/internal/cache/DiskLruCacheTest.kt b/okhttp/src/test/java/okhttp3/internal/cache/DiskLruCacheTest.kt
index fc9ca0c20..98f807790 100644
--- a/okhttp/src/test/java/okhttp3/internal/cache/DiskLruCacheTest.kt
+++ b/okhttp/src/test/java/okhttp3/internal/cache/DiskLruCacheTest.kt
@@ -29,6 +29,7 @@ import okio.buffer
 import org.assertj.core.api.Assertions.assertThat
 import org.junit.jupiter.api.AfterEach
 import org.junit.jupiter.api.Assumptions
+import org.junit.jupiter.api.Tag
 import org.junit.jupiter.api.Timeout
 import org.junit.jupiter.api.fail
 import org.junit.jupiter.api.io.TempDir
@@ -49,6 +50,7 @@ class FileSystemParamProvider: SimpleProvider() {
 }
 
 @Timeout(60)
+@Tag("Slow")
 class DiskLruCacheTest {
   private lateinit var fileSystem: FaultyFileSystem
   private var windows: Boolean = false
@@ -492,7 +494,7 @@ class DiskLruCacheTest {
     writeFile(getCleanFile("k1", 1), "B")
     fileSystem.sink(journalFile).buffer().use {
       it.writeUtf8(
-          """
+        """
           |${DiskLruCache.MAGIC}
           |${DiskLruCache.VERSION_1}
           |100
@@ -1058,7 +1060,7 @@ class DiskLruCacheTest {
 
     // Cause the rebuild action to fail.
     fileSystem.setFaultyRename(
-        File(cacheDir, DiskLruCache.JOURNAL_FILE_BACKUP), true
+      File(cacheDir, DiskLruCache.JOURNAL_FILE_BACKUP), true
     )
     taskFaker.runNextTask()
 
@@ -1959,7 +1961,8 @@ class DiskLruCacheTest {
     creator.commit()
     val snapshotAfterCommit = cache.snapshots()
     assertThat(snapshotAfterCommit.hasNext()).withFailMessage(
-        "Entry has been removed during creation.").isTrue()
+      "Entry has been removed during creation."
+    ).isTrue()
   }
 
   @ParameterizedTest
@@ -2158,13 +2161,14 @@ class DiskLruCacheTest {
 
   private fun assertJournalEquals(vararg expectedBodyLines: String) {
     assertThat(readJournalLines()).isEqualTo(
-        listOf(DiskLruCache.MAGIC, DiskLruCache.VERSION_1, "100", "2", "") + expectedBodyLines)
+      listOf(DiskLruCache.MAGIC, DiskLruCache.VERSION_1, "100", "2", "") + expectedBodyLines
+    )
   }
 
   private fun createJournal(vararg bodyLines: String) {
     createJournalWithHeader(
-        DiskLruCache.MAGIC,
-        DiskLruCache.VERSION_1, "100", "2", "", *bodyLines
+      DiskLruCache.MAGIC,
+      DiskLruCache.VERSION_1, "100", "2", "", *bodyLines
     )
   }
 
@@ -2177,7 +2181,8 @@ class DiskLruCacheTest {
     vararg bodyLines: String
   ) {
     fileSystem.sink(journalFile).buffer().use { sink ->
-      sink.writeUtf8("""
+      sink.writeUtf8(
+        """
         |$magic
         |$version
         |$appVersion
diff --git a/okhttp/src/test/java/okhttp3/internal/cache2/RelayTest.java b/okhttp/src/test/java/okhttp3/internal/cache2/RelayTest.java
index 2691b9116..6944be145 100644
--- a/okhttp/src/test/java/okhttp3/internal/cache2/RelayTest.java
+++ b/okhttp/src/test/java/okhttp3/internal/cache2/RelayTest.java
@@ -30,12 +30,14 @@ import okio.Pipe;
 import okio.Source;
 import org.junit.jupiter.api.AfterEach;
 import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Tag;
 import org.junit.jupiter.api.Test;
 import org.junit.jupiter.api.io.TempDir;
 
 import static org.assertj.core.api.Assertions.assertThat;
 import static org.junit.jupiter.api.Assertions.fail;
 
+@Tag("Slowish")
 public final class RelayTest {
   @TempDir File tempDir;
   private ExecutorService executor = Executors.newCachedThreadPool();
diff --git a/okhttp/src/test/java/okhttp3/internal/concurrent/TaskRunnerRealBackendTest.kt b/okhttp/src/test/java/okhttp3/internal/concurrent/TaskRunnerRealBackendTest.kt
index ac8c18495..d58db5d60 100644
--- a/okhttp/src/test/java/okhttp3/internal/concurrent/TaskRunnerRealBackendTest.kt
+++ b/okhttp/src/test/java/okhttp3/internal/concurrent/TaskRunnerRealBackendTest.kt
@@ -22,6 +22,7 @@ import java.util.concurrent.TimeUnit
 import org.assertj.core.api.Assertions.assertThat
 import org.assertj.core.data.Offset
 import org.junit.jupiter.api.AfterEach
+import org.junit.jupiter.api.Tag
 import org.junit.jupiter.api.Test
 
 /**
@@ -31,6 +32,7 @@ import org.junit.jupiter.api.Test
  * This test is doing real sleeping with tolerances of 250 ms. Hopefully that's enough for even the
  * busiest of CI servers.
  */
+@Tag("Slowish")
 class TaskRunnerRealBackendTest {
   private val log = LinkedBlockingDeque<String>()
 
diff --git a/okhttp/src/test/java/okhttp3/internal/http/CancelTest.kt b/okhttp/src/test/java/okhttp3/internal/http/CancelTest.kt
index a990451dc..c29216465 100644
--- a/okhttp/src/test/java/okhttp3/internal/http/CancelTest.kt
+++ b/okhttp/src/test/java/okhttp3/internal/http/CancelTest.kt
@@ -49,6 +49,7 @@ import okio.Buffer
 import okio.BufferedSink
 import org.assertj.core.api.Assertions.assertThat
 import org.junit.jupiter.api.Assertions.assertEquals
+import org.junit.jupiter.api.Tag
 import org.junit.jupiter.api.Timeout
 import org.junit.jupiter.api.extension.RegisterExtension
 import org.junit.jupiter.api.fail
@@ -62,6 +63,7 @@ import javax.net.ServerSocketFactory
 import javax.net.SocketFactory
 
 @Timeout(30)
+@Tag("Slow")
 class CancelTest {
   @JvmField @RegisterExtension val platform = PlatformRule()
 
@@ -125,7 +127,9 @@ class CancelTest {
             return socket
           }
         })
-        .sslSocketFactory(handshakeCertificates.sslSocketFactory(), handshakeCertificates.trustManager)
+        .sslSocketFactory(
+          handshakeCertificates.sslSocketFactory(), handshakeCertificates.trustManager
+        )
         .eventListener(listener)
         .apply {
           if (connectionType == HTTPS) { protocols(listOf(HTTP_1_1)) }
@@ -140,25 +144,25 @@ class CancelTest {
     setUp(mode)
     server.enqueue(MockResponse())
     val call = client.newCall(
-        Request.Builder()
-            .url(server.url("/"))
-            .post(object : RequestBody() {
-              override fun contentType(): MediaType? {
-                return null
-              }
+      Request.Builder()
+        .url(server.url("/"))
+        .post(object : RequestBody() {
+          override fun contentType(): MediaType? {
+            return null
+          }
 
-              @Throws(
-                  IOException::class
-              ) override fun writeTo(sink: BufferedSink) {
-                for (i in 0..9) {
-                  sink.writeByte(0)
-                  sink.flush()
-                  sleep(100)
-                }
-                fail("Expected connection to be closed")
-              }
-            })
-            .build()
+          @Throws(
+            IOException::class
+          ) override fun writeTo(sink: BufferedSink) {
+            for (i in 0..9) {
+              sink.writeByte(0)
+              sink.flush()
+              sleep(100)
+            }
+            fail("Expected connection to be closed")
+          }
+        })
+        .build()
     )
     cancelLater(call, 500)
     try {
@@ -175,17 +179,17 @@ class CancelTest {
     setUp(mode)
     val responseBodySize = 8 * 1024 * 1024 // 8 MiB.
     server.enqueue(
-        MockResponse()
-            .setBody(
-                Buffer()
-                    .write(ByteArray(responseBodySize))
-            )
-            .throttleBody(64 * 1024, 125, MILLISECONDS)
+      MockResponse()
+        .setBody(
+          Buffer()
+            .write(ByteArray(responseBodySize))
+        )
+        .throttleBody(64 * 1024, 125, MILLISECONDS)
     ) // 500 Kbps
     val call = client.newCall(
-        Request.Builder()
-            .url(server.url("/"))
-            .build()
+      Request.Builder()
+        .url(server.url("/"))
+        .build()
     )
     val response = call.execute()
     cancelLater(call, 500)
@@ -208,12 +212,12 @@ class CancelTest {
     setUp(mode)
     val responseBodySize = 8 * 1024 * 1024 // 8 MiB.
     server.enqueue(
-        MockResponse()
-            .setBody(
-                Buffer()
-                    .write(ByteArray(responseBodySize))
-            )
-            .throttleBody(64 * 1024, 125, MILLISECONDS)
+      MockResponse()
+        .setBody(
+          Buffer()
+            .write(ByteArray(responseBodySize))
+        )
+        .throttleBody(64 * 1024, 125, MILLISECONDS)
     ) // 500 Kbps
     server.enqueue(MockResponse().apply {
       setResponseCode(200)
@@ -305,5 +309,7 @@ class CancelTest {
 }
 
 class CancelModelParamProvider: SimpleProvider() {
-  override fun arguments() = CancelTest.CancelMode.values().flatMap { c -> CancelTest.ConnectionType.values().map { x -> Pair(c, x) } }
+  override fun arguments() = CancelTest.CancelMode.values().flatMap { c -> CancelTest.ConnectionType.values().map { x -> Pair(
+    c, x
+  ) } }
 }
diff --git a/okhttp/src/test/java/okhttp3/internal/http/ThreadInterruptTest.java b/okhttp/src/test/java/okhttp3/internal/http/ThreadInterruptTest.java
index 42d765633..d440035c8 100644
--- a/okhttp/src/test/java/okhttp3/internal/http/ThreadInterruptTest.java
+++ b/okhttp/src/test/java/okhttp3/internal/http/ThreadInterruptTest.java
@@ -39,11 +39,13 @@ import okio.Buffer;
 import okio.BufferedSink;
 import org.junit.jupiter.api.AfterEach;
 import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Tag;
 import org.junit.jupiter.api.Test;
 import org.junit.jupiter.api.extension.RegisterExtension;
 
 import static org.junit.jupiter.api.Assertions.fail;
 
+@Tag("Slowish")
 public final class ThreadInterruptTest {
   @RegisterExtension public final PlatformRule platform = new PlatformRule();
   @RegisterExtension public final OkHttpClientTestRule clientTestRule = new OkHttpClientTestRule();
diff --git a/okhttp/src/test/java/okhttp3/internal/http2/Http2ConnectionTest.java b/okhttp/src/test/java/okhttp3/internal/http2/Http2ConnectionTest.java
index 15677b2fa..746e7feef 100644
--- a/okhttp/src/test/java/okhttp3/internal/http2/Http2ConnectionTest.java
+++ b/okhttp/src/test/java/okhttp3/internal/http2/Http2ConnectionTest.java
@@ -39,6 +39,7 @@ import okio.Okio;
 import okio.Sink;
 import okio.Source;
 import org.junit.jupiter.api.AfterEach;
+import org.junit.jupiter.api.Tag;
 import org.junit.jupiter.api.Test;
 import org.junit.jupiter.api.Timeout;
 
@@ -64,6 +65,7 @@ import static org.junit.jupiter.api.Assertions.assertArrayEquals;
 import static org.junit.jupiter.api.Assertions.fail;
 
 @Timeout(5)
+@Tag("Slow")
 public final class Http2ConnectionTest {
   private final MockHttp2Peer peer = new MockHttp2Peer();
 
diff --git a/okhttp/src/test/java/okhttp3/internal/http2/HttpOverHttp2Test.java b/okhttp/src/test/java/okhttp3/internal/http2/HttpOverHttp2Test.java
index eba233a7d..0c7d00d5f 100644
--- a/okhttp/src/test/java/okhttp3/internal/http2/HttpOverHttp2Test.java
+++ b/okhttp/src/test/java/okhttp3/internal/http2/HttpOverHttp2Test.java
@@ -75,6 +75,7 @@ import okio.GzipSink;
 import okio.Okio;
 import org.junit.jupiter.api.AfterEach;
 import org.junit.jupiter.api.Disabled;
+import org.junit.jupiter.api.Tag;
 import org.junit.jupiter.api.Timeout;
 import org.junit.jupiter.api.extension.RegisterExtension;
 import org.junit.jupiter.api.io.TempDir;
@@ -96,6 +97,7 @@ import static org.junit.jupiter.api.Assumptions.assumeTrue;
 /** Test how HTTP/2 interacts with HTTP features. */
 @Timeout(60)
 @Flaky
+@Tag("Slow")
 public final class HttpOverHttp2Test {
   // Flaky https://github.com/square/okhttp/issues/4632
   // Flaky https://github.com/square/okhttp/issues/4633
diff --git a/okhttp/src/test/java/okhttp3/internal/http2/SettingsTest.java b/okhttp/src/test/java/okhttp3/internal/http2/SettingsTest.java
index 55cbfc3c1..93274c297 100644
--- a/okhttp/src/test/java/okhttp3/internal/http2/SettingsTest.java
+++ b/okhttp/src/test/java/okhttp3/internal/http2/SettingsTest.java
@@ -15,7 +15,7 @@
  */
 package okhttp3.internal.http2;
 
-import org.junit.Test;
+import org.junit.jupiter.api.Test;
 
 import static okhttp3.internal.http2.Settings.DEFAULT_INITIAL_WINDOW_SIZE;
 import static okhttp3.internal.http2.Settings.MAX_CONCURRENT_STREAMS;
diff --git a/okhttp/src/test/java/okhttp3/internal/tls/ClientAuthTest.java b/okhttp/src/test/java/okhttp3/internal/tls/ClientAuthTest.java
index 01bb4b241..1e6429b46 100644
--- a/okhttp/src/test/java/okhttp3/internal/tls/ClientAuthTest.java
+++ b/okhttp/src/test/java/okhttp3/internal/tls/ClientAuthTest.java
@@ -47,6 +47,7 @@ import okhttp3.testing.PlatformVersion;
 import okhttp3.tls.HandshakeCertificates;
 import okhttp3.tls.HeldCertificate;
 import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Tag;
 import org.junit.jupiter.api.Test;
 import org.junit.jupiter.api.extension.ExtendWith;
 import org.junit.jupiter.api.extension.RegisterExtension;
@@ -58,6 +59,7 @@ import static okhttp3.tls.internal.TlsUtil.newTrustManager;
 import static org.assertj.core.api.Assertions.assertThat;
 import static org.junit.jupiter.api.Assertions.fail;
 
+@Tag("Slowish")
 @ExtendWith(MockWebServerExtension.class)
 public final class ClientAuthTest {
   @RegisterExtension public final PlatformRule platform = new PlatformRule();
diff --git a/okhttp/src/test/java/okhttp3/internal/ws/RealWebSocketTest.java b/okhttp/src/test/java/okhttp3/internal/ws/RealWebSocketTest.java
index 5868f45ca..317055412 100644
--- a/okhttp/src/test/java/okhttp3/internal/ws/RealWebSocketTest.java
+++ b/okhttp/src/test/java/okhttp3/internal/ws/RealWebSocketTest.java
@@ -33,6 +33,7 @@ import okio.Pipe;
 import org.junit.jupiter.api.AfterEach;
 import org.junit.jupiter.api.BeforeEach;
 import org.junit.jupiter.api.Disabled;
+import org.junit.jupiter.api.Tag;
 import org.junit.jupiter.api.Test;
 
 import static okhttp3.internal.ws.RealWebSocket.DEFAULT_MINIMUM_DEFLATE_SIZE;
@@ -40,6 +41,7 @@ import static org.assertj.core.api.Assertions.assertThat;
 import static org.assertj.core.data.Offset.offset;
 import static org.junit.jupiter.api.Assertions.fail;
 
+@Tag("Slow")
 public final class RealWebSocketTest {
   // NOTE: Fields are named 'client' and 'server' for cognitive simplicity. This differentiation has
   // zero effect on the behavior of the WebSocket API which is why tests are only written once
diff --git a/okhttp/src/test/java/okhttp3/internal/ws/WebSocketHttpTest.java b/okhttp/src/test/java/okhttp3/internal/ws/WebSocketHttpTest.java
index b8e0888d7..f7ed3777b 100644
--- a/okhttp/src/test/java/okhttp3/internal/ws/WebSocketHttpTest.java
+++ b/okhttp/src/test/java/okhttp3/internal/ws/WebSocketHttpTest.java
@@ -51,6 +51,7 @@ import okio.ByteString;
 import org.junit.jupiter.api.AfterEach;
 import org.junit.jupiter.api.BeforeEach;
 import org.junit.jupiter.api.Disabled;
+import org.junit.jupiter.api.Tag;
 import org.junit.jupiter.api.Test;
 import org.junit.jupiter.api.extension.RegisterExtension;
 
@@ -62,6 +63,7 @@ import static org.assertj.core.data.Offset.offset;
 import static org.junit.jupiter.api.Assertions.fail;
 
 @Flaky
+@Tag("Slow")
 public final class WebSocketHttpTest {
   // Flaky https://github.com/square/okhttp/issues/4515
   // Flaky https://github.com/square/okhttp/issues/4953
diff --git a/okhttp/src/test/java/okhttp3/osgi/OsgiTest.java b/okhttp/src/test/java/okhttp3/osgi/OsgiTest.java
index 79e1dfc65..60bb09259 100644
--- a/okhttp/src/test/java/okhttp3/osgi/OsgiTest.java
+++ b/okhttp/src/test/java/okhttp3/osgi/OsgiTest.java
@@ -32,8 +32,10 @@ import java.util.stream.Collectors;
 import okio.BufferedSource;
 import okio.Okio;
 import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Tag;
 import org.junit.jupiter.api.Test;
 
+@Tag("Slow")
 public final class OsgiTest {
   /** Each is the Bundle-SymbolicName of an OkHttp module's OSGi configuration. */
   private static final List<String> REQUIRED_BUNDLES = Arrays.asList(
diff --git a/samples/guide/src/test/kotlin/okhttp3/AllMainsTest.kt b/samples/guide/src/test/kotlin/okhttp3/AllMainsTest.kt
index fa2a4e49b..f08e24e32 100644
--- a/samples/guide/src/test/kotlin/okhttp3/AllMainsTest.kt
+++ b/samples/guide/src/test/kotlin/okhttp3/AllMainsTest.kt
@@ -16,6 +16,7 @@
 package okhttp3
 
 import org.junit.jupiter.api.Disabled
+import org.junit.jupiter.api.Tag
 import org.junit.jupiter.params.ParameterizedTest
 import org.junit.jupiter.params.provider.ArgumentsSource
 import java.io.File
@@ -50,6 +51,7 @@ internal class MainTestProvider : SimpleProvider() {
 }
 
 @Disabled("Don't run by default")
+@Tag("Slow")
 class AllMainsTest {
   @ParameterizedTest
   @ArgumentsSource(MainTestProvider::class)