[Webkit-unassigned] [Bug 219751] New: Efficient low frequency animations

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=219751

            Bug ID: 219751
           Summary: Efficient low frequency animations
           Product: WebKit
           Version: Safari Technology Preview
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Animations
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: jaffathecake at gmail.com
                CC: dino at apple.com

I did some research on how efficient browsers are at animations where not-a-lot happens.

https://static-misc-2.glitch.me/low-freq-anims/

I played with the above while monitoring the task manager.

The "High frequency animation" shows how much CPU is used on a 60hz (or whatever display frequency) animation.

"setTimeout" shows how much CPU is used for a setTimeout-driven animation that updates every 5 seconds. This uses almost no CPU.

The rest are CSS/web animations that update infrequently.

I'm _really_ impressed with how Safari handles these cases, but there are some opportunities for optimisation.

In the following tests:

- Discrete values
- Mostly same values
- Empty animation

…Safari seems to use more CPU than necessary, as if it's running a 60hz timer internally.

Related Chrome issue: https://bugs.chromium.org/p/chromium/issues/detail?id=1157483

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