In Firefox in particular they've changed how animations are done, for instance removing transparency where it wasn't needed https://bugzilla.mozilla.org/show_bu

In Firefox in particular they've changed how animations are done, for instance removing transparency where it wasn't needed https://bugzilla.mozilla.org/show_bug.cgi?id=1429522#c26 https://bugzilla.mozilla.org/show_bug.cgi?id=1429522#c26 In general you want to - do less work (e.g. don't do unnecessary work, cache results) - do it less often (coalesce the work you have so the machine can go into deeper idle states) - do it more efficiently (e.g. do graphics on the GPU instead of CPU)