Running firefox from latest mozilla-central, compiled for GTK2 or GTK3. When playing a youtube video, during loading, flash shows a spinner. That spinner is freezing/stopping for short amounts of time, it's not spinning smoothly. This used to be fine (tested on Firefox 29 (iceweasel) from Debian), so looks like a regression. See also https://bugzilla.mozilla.org/show_bug.cgi?id=624422#c125 and https://bugzilla.mozilla.org/show_bug.cgi?id=624422#c126

After some investigations, this no longer looks like a regression. I tried to bisect on mozilla-central without much success as I as getting build failures when building old revisions (as in a few months old). So I went and tested nightlies and they were working ok. So perhaps this isn't actually a regression, but caused by something else, e.g. because of debug builds, that perform checks and so are slower, possibly causing this short glitches. I'll try an optimized build and see if that helps.

I see the freeze on debug/unoptimized builds only. Works fine for me with enabled optimization. Tested on Fedora 20/latest trunk. RPM packages are available at copr: http://copr-be.cloud.fedoraproject.org/results/stransky/FirefoxGtk3/fedora-20-x86_64/firefox-gtk3-32.0-1.fc20/ http://copr-be.cloud.fedoraproject.org/results/stransky/FirefoxGtk3/fedora-20-i386/firefox-gtk3-32.0-1.fc20/

Indeed, I can't reproduce when building with --disable-debug --enable-optimize. Should we keep this open? It seems normal that some debug checks or non-optimize code could cause such glitches.

Yeah, many things are just slow in debug builds.

OK, closing. It doesn't make a lot of sense to optimize non-optimized builds after all :)