[Webkit-unassigned] [Bug 215745] New: Throttling requestAnimation Frame to 30 FPS in low power mode on iOS 14 (but not iOS 13)

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=215745

            Bug ID: 215745
           Summary: Throttling requestAnimation Frame to 30 FPS in low
                    power mode on iOS 14 (but not iOS 13)
           Product: WebKit
           Version: WebKit Local Build
          Hardware: iPhone / iPad
                OS: Other
            Status: NEW
          Severity: Major
          Priority: P2
         Component: Frames
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: sirong.chen at snapchat.com

Overview
We noticed that this FPS throttling behavior in low power mode is reproducible on iOS 14 beta 4, but not on iOS 13. We want to confirm whether this change on iOS 14 is feature or a bug.

Steps to Reproduce: 
On iOS 14 beta 4. Turning on the low power mode, the max threshold of requestAnimationFrame FPS will be 30. This behavior was not there on iOS 13.

Expected Results: 
Same to iOS 13, the FPS is not throttled.

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