[Webkit-unassigned] [Bug 282267] New: Same-document View Transitions Performance Janky with Many Elements

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=282267

            Bug ID: 282267
           Summary: Same-document View Transitions Performance Janky with
                    Many Elements
           Product: WebKit
           Version: Safari Technology Preview
          Hardware: Mac (Apple Silicon)
                OS: macOS 15
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Animations
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: ncoury at google.com
                CC: graouts at apple.com

With a large number of shared elements, performance on Safari becomes extremely slow and janky with a minimal frame rate, even with default transitions and no custom styling. This is in contrast to Chrome where the animation is smooth overall.

Demo: https://codepen.io/Nick-Coury/pen/MWNVXog

Reproduction: Click the demo tiles to initiate view transitions.

Videos were taken on a 2023 16-Inch MacBook Pro M3 Pro.
Chrome: https://photos.app.goo.gl/rbXxi7xuX95QQtsc7
Safari: https://photos.app.goo.gl/KodarEu3ssJ6Jn449

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