It looks like the off-main-thread animations landing actually stuck this time; it's now on mozilla-central. It should be on in tomorrow's nightly (2015-04-07) assuming nothing changes, for platforms other than Linux.
(I didn't enable it #ifdef MOZ_X11 because of https://bugzilla.mozilla.org/show_bug.cgi?id=1150619 .) -David On Tuesday 2015-03-31 21:23 -0700, L. David Baron wrote: > I just landed (on mozilla-inbound) a patch for > https://bugzilla.mozilla.org/show_bug.cgi?id=980770 that enables > off-main-thread (OMT) animations on nightly and aurora. This > feature has previously been enabled on Firefox OS since Firefox OS > 1.0, but until now it has been disabled elsewhere. > > Off-main-thread animations means that we run animations of some CSS > properties (currently only opacity and transform) on the compositor > thread, and stop doing style updates on the main thread. Running > the updates on the compositor thread makes the animations run more > smoothly (since their smoothness is no longer dependent on other > things not hogging the main thread), and not doing the style updates > on the main thread reduces the amount of work that we do (rather > than increasing it). > > Depending on merge timing, and presuming that the change isn't > backed out, this might hit nightly either tomorrow (April 1) or > Thursday (April 2). > > Regressions from enabling it should be made to block bug 980770. > > If you want to test if something is a regression from it, toggle the > pref "layers.offmainthreadcomposition.async-animations". (Reloading > the page is probably needed for it to take effect fully, although it > shouldn't require a restart, unless it's a bug in the Firefox UI.) > > Since this is the beginning of the six-week release cycle, I'm > hoping that we'll be able to flip the pref unconditionally by the > end of this cycle and let it ride the trains to release. However, > it's currently enabled only for nightly and aurora. -- 𝄞 L. David Baron http://dbaron.org/ 𝄂 𝄢 Mozilla https://www.mozilla.org/ 𝄂 Before I built a wall I'd ask to know What I was walling in or walling out, And to whom I was like to give offense. - Robert Frost, Mending Wall (1914)
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