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. -David -- 𝄞 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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