[Webkit-unassigned] [Bug 226321] New: Animation FPS drops if SVG changes from becomes visible from opacity 0

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=226321

            Bug ID: 226321
           Summary: Animation FPS drops if SVG changes from becomes
                    visible from opacity 0
           Product: WebKit
           Version: Safari 14
          Hardware: iPhone / iPad
                OS: iOS 14
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: New Bugs
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: roland at nextendweb.com

Created attachment 429862

  --> https://bugs.webkit.org/attachment.cgi?id=429862&action=review

Screen recording

Steps to reproduce:
1. Open https://smartslider3.com/bugs/webkit/opacity0dropfps/

Expected result: FPS should be consistent during the animation

Actual result: When the SVG becomes visible from opacity(opacity:0 and then in the next frame gets bigger than 0) cause the animation to feel sluggish as probably rendering of the resource allocate the main thread.


Workaround: use non-zero small opacity like 0.1 for starting point.

Able to reproduce:
iPad 14.5.1
iPhone 14.6

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