More on Firefox, Color Management and Performance

Continuation of this thread which maxed out:

http://forums.dpreview.com/forums/readflat.asp?forum=1004&thread=39797555

It seems that there's a known issue with progressive JPEG's that has been around since 2008:

https://bugzilla.mozilla.org/show_bug.cgi?id=435628

However, there are several wrinkles that may or may not be related to this:

• Performance with images loaded from the network is significantly worse than with images loaded from disk. The delta is a lot larger than it should be based on my (considerable) experience measuring the software overheads with networking.

• I can measure even worse performance under certain conditions (e.g. simply opening another empty FF tab).

• The progressive rendering stalling under certain conditions. Jim and I have both reproduced this under various different scenarios but have not really characterized it fully.

• Suggestions that performance may be dramatically better on some systems.

Another report:

https://bugzilla.mozilla.org/show_bug.cgi?id=715919

suggests there may be a relationship between progressive images and libjpeg-turbo. Jim, is it possible your new improved Linux versions are linking to libjpeg versus libjpeg-turbo?