Previous code was using slow routines to collect some of the information
needed to output images. Specifically size was being calculated instead
of using the cached, already known size already available. Also, straight-
lined several of the code paths. Overall assessment is that these
improvements cut the time for images in half.
Signed-off-by: baude <bbaude@redhat.com>
Closes: #365
Approved by: mheon