diff --git a/apps/automated/src/timer/timer-tests.ts b/apps/automated/src/timer/timer-tests.ts
index 99c633828..4f8f10bbb 100644
--- a/apps/automated/src/timer/timer-tests.ts
+++ b/apps/automated/src/timer/timer-tests.ts
@@ -171,6 +171,40 @@ export function test_setInterval_callbackCalledWithExtraArgs(done) {
 	);
 }
 
+export function test_setInterval_callbackNotDelayedByBusyWork() {
+	let calls = 0;
+
+	let firstCall = true;
+	const id = timer.setInterval(() => {
+		calls++;
+		if (firstCall) {
+			firstCall = false;
+			TKUnit.wait(0.025);
+		}
+	}, 50);
+
+	TKUnit.wait(0.11);
+	timer.clearInterval(id);
+	TKUnit.assertEqual(calls, 2, 'Callback should be called multiple times with busy wait');
+}
+
+export function test_setInterval_callbackSkippedByBusyWork() {
+	let calls = 0;
+
+	let firstCall = true;
+	const id = timer.setInterval(() => {
+		calls++;
+		if (firstCall) {
+			firstCall = false;
+			TKUnit.wait(0.051);
+		}
+	}, 50);
+
+	TKUnit.wait(0.16);
+	timer.clearInterval(id);
+	TKUnit.assertEqual(calls, 2, 'Callback should be called skipped when it takes too long to process');
+}
+
 export function test_setInterval_callbackShouldBeCleared(done) {
 	const start = TKUnit.time();
 	// >> timer-set-interval
diff --git a/packages/core/application/application-interfaces.ts b/packages/core/application/application-interfaces.ts
index 9427f68a4..13ea7fa5c 100644
--- a/packages/core/application/application-interfaces.ts
+++ b/packages/core/application/application-interfaces.ts
@@ -20,7 +20,7 @@ export interface ApplicationEventData extends EventData {
 }
 
 export interface LaunchEventData extends ApplicationEventData {
-	root?: View;
+	root?: View | null;
 	savedInstanceState?: any /* android.os.Bundle */;
 }
 
diff --git a/packages/core/application/index.android.ts b/packages/core/application/index.android.ts
index c3dbacd38..50ce16597 100644
--- a/packages/core/application/index.android.ts
+++ b/packages/core/application/index.android.ts
@@ -191,7 +191,7 @@ export function addCss(cssText: string, attributeScoped?: boolean): void {
 const CALLBACKS = '_callbacks';
 
 export function _resetRootView(entry?: NavigationEntry | string): void {
-	const activity = androidApp.foregroundActivity;
+	const activity = androidApp.foregroundActivity || androidApp.startActivity;
 	if (!activity) {
 		throw new Error('Cannot find android activity.');
 	}
diff --git a/packages/core/application/index.d.ts b/packages/core/application/index.d.ts
index 8688aebc5..d87a3a33d 100644
--- a/packages/core/application/index.d.ts
+++ b/packages/core/application/index.d.ts
@@ -103,8 +103,9 @@ export interface LaunchEventData extends ApplicationEventData {
 	/**
 	 * The root view for this Window on iOS or Activity for Android.
 	 * If not set a new Frame will be created as a root view in order to maintain backwards compatibility.
+	 * If explicitly set to null, there will be no root view.
 	 */
-	root?: View;
+	root?: View | null;
 
 	savedInstanceState?: any /* android.os.Bundle */;
 }
diff --git a/packages/core/application/index.ios.ts b/packages/core/application/index.ios.ts
index e502b4758..f36cafb70 100644
--- a/packages/core/application/index.ios.ts
+++ b/packages/core/application/index.ios.ts
@@ -207,7 +207,9 @@ export class iOSApplication implements iOSApplicationDefinition {
 
 		// this._window will be undefined when NS app is embedded in a native one
 		if (this._window) {
-			this.setWindowContent(args.root);
+			if (args.root !== null) {
+				this.setWindowContent(args.root);
+			}
 		} else {
 			this._window = UIApplication.sharedApplication.delegate.window;
 		}
diff --git a/packages/core/color/color-common.ts b/packages/core/color/color-common.ts
index 8408838f3..f97a8a87b 100644
--- a/packages/core/color/color-common.ts
+++ b/packages/core/color/color-common.ts
@@ -1,4 +1,4 @@
-import * as definition from '.';
+import * as definition from '.';
 import * as types from '../utils/types';
 import * as knownColors from './known-colors';
 import { convertHSLToRGBColor } from '../css/parser';
@@ -174,7 +174,7 @@ export class Color implements definition.Color {
 	}
 
 	/**
-	 * return true if brightenss < 128
+	 * return true if brightness < 128
 	 *
 	 */
 	public isDark() {
@@ -182,7 +182,7 @@ export class Color implements definition.Color {
 	}
 
 	/**
-	 * return true if brightenss >= 128
+	 * return true if brightness >= 128
 	 *
 	 */
 	public isLight() {
diff --git a/packages/core/timer/index.android.ts b/packages/core/timer/index.android.ts
index 06d42d958..8bf793113 100644
--- a/packages/core/timer/index.android.ts
+++ b/packages/core/timer/index.android.ts
@@ -58,12 +58,16 @@ export function setInterval(callback: Function, milliseconds = 0, ...args): numb
 	const handler = timeoutHandler;
 	const invoke = () => callback(...args);
 	const zoneBound = zonedCallback(invoke);
+	const startOffset = milliseconds > 0 ? Date.now() % milliseconds : 0;
+	function nextCallMs() {
+		return milliseconds > 0 ? milliseconds - ((Date.now() - startOffset) % milliseconds) : milliseconds;
+	}
 
 	const runnable = new java.lang.Runnable({
 		run: () => {
 			zoneBound();
 			if (timeoutCallbacks[id]) {
-				handler.postDelayed(runnable, long(milliseconds));
+				handler.postDelayed(runnable, long(nextCallMs()));
 			}
 		},
 	});
@@ -72,7 +76,7 @@ export function setInterval(callback: Function, milliseconds = 0, ...args): numb
 		timeoutCallbacks[id] = runnable;
 	}
 
-	timeoutHandler.postDelayed(runnable, long(milliseconds));
+	timeoutHandler.postDelayed(runnable, long(nextCallMs()));
 
 	return id;
 }
diff --git a/packages/core/ui/frame/index.android.ts b/packages/core/ui/frame/index.android.ts
index dce7b556f..418fdd9bf 100644
--- a/packages/core/ui/frame/index.android.ts
+++ b/packages/core/ui/frame/index.android.ts
@@ -1305,13 +1305,19 @@ class ActivityCallbacksImplementation implements AndroidActivityCallbacks {
 		if (!rootView) {
 			const mainEntry = application.getMainEntry();
 			const intent = activity.getIntent();
+			// useful for integrations that would like to set rootView asynchronously after app launch
+			let shouldRootViewBeEmpty = false;
 
 			if (fireLaunchEvent) {
 				// entry point for Angular and Vue frameworks
 				rootView = notifyLaunch(intent, <any>savedInstanceState, null);
+				shouldRootViewBeEmpty = rootView === null;
 			}
 
 			if (!rootView) {
+				if (shouldRootViewBeEmpty) {
+					return;
+				}
 				// entry point for NS Core
 				if (!mainEntry) {
 					// Also handles scenarios with Angular and Vue where the notifyLaunch didn't return a root view.