User Agent: Mozilla/5.0 (X11; Linux x86_64; rv:19.0) Gecko/19.0 Firefox/19.0 Build ID: 20121013030542 Steps to reproduce: Ubuntu 12.04.1 Linux kernel 3.2.0.32-generic x86_64 2.1 Mesa 8.0.2 Active OMTC (https://mozillagfx.wordpress.com/2012/10/06/how-to-help-testing-off-main-thread-compositing/) Test Psychedelic https://ie.microsoft.com/testdrive/Performance/PsychedelicBrowsing/Default.html and launch the test FishIETank: https://ie.microsoft.com/testdrive/Performance/FishIETank/Default.html and launch the test. Actual results: Test Psychedelic: FF 16.0.1 4530 revolution per minutes Hallucinogen mode 2050 revolution per minute FF 19.0a1 0008 revolution per minutes Hallucinogen mode 2050 revolution per minute It's better if reduce the windows 87 revolution per minutes (881x439) but never i could pass Hallucinogene mode FishIETank: FF 16.0.1 Windows size 1301x678 20 Fish (55-60FPS) not very smooth 500 Fish (10-30FPS) slow FF 19.0a1 Windows size 1301x655 20 Fish (08-10FPS) slow 500 Fish (05-08 FPS) slow Expected results: Test Psychedelic: Have the same revolution per minutes (or better) and pass Hallucinogen mode FishIETank: Have the same FPS like in FF16

Test with Firefox Nightly 24.0a1 (2013-05-19) and Mesa 9.2.0 (git-639d0f7 precise-oibaf-ppa) Test Psychedelic: FF 24.0a1 0009 revolution per minutes Hallucinogen mode 2050 revolution per minute FishetIE Tank Windows size 1301x655 : 20 Fishs -> 6-7 fps 500 Fishs -> 5 fps

With linux 3.8 x86_64 and Mesa 9.1.4: Test Psychedelic: FF 24 1890 revolutions per minutes Hallucinogen mode 633 revolutions per minute FF 27;0a 0829 revolutions per minutes Hallucinogen mode 305 revolutions per minute FishIETank: FF 24.0 Windows size 1301x668 20 Fish (60FPS) very smooth and fast 500 Fish (45-50FPS)no slow but no fast too FF 19.0a1 Windows size 1301x655 20 Fish (20-28 FPS) a little slow 500 Fish (10-20 FPS) slow May be the best result between FF 16 and FF 24 in FishIETank, it's the asm.js 's effect (come in FF22). For OMTC, there are a progression between FF 19 and FF 27

Mass tracking-e10s flag change. Filter bugmail on "2be0fcce-e36a-4e2c-aa80-0e3d33eb5406".