[Webkit-unassigned] [Bug 246792] New: Laggy Animated WEBP Rendering

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=246792

            Bug ID: 246792
           Summary: Laggy Animated WEBP Rendering
           Product: WebKit
           Version: Safari 16
          Hardware: Mac (Apple Silicon)
                OS: macOS 13
            Status: NEW
          Severity: Major
          Priority: P2
         Component: Images
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: cryptoalgro+bugzilla at gmail.com
                CC: sabouhallawa at apple.com

Created attachment 463108

  --> https://bugs.webkit.org/attachment.cgi?id=463108&action=review

Chrome vs Safari rendering the same animated WEBP

Safari has full support for the WEBP and animated WEBP image format (reference - https://caniuse.com/webp). However,  rendering of larger animated WEBP files are extremely janky, to the extent that the image is unviewable. A ~10MB, 1600 × 1039px and 15FPS animated WEBP encoded with FFMPEG exhibits this issue, as seen in https://github.com/SwiftcordApp/Swiftcord/blob/main/README.md. Rendering starts out mildly laggy (frame skips, each frame takes too long to render), then quickly descends into a slideshow. Viewing the same website on Chrome works perfectly, which shows that this isn't an encoding issue. I've tested with smaller animated WEBP images and found that smaller images slow down the onset of lag.

A screen recording demonstrating the same website on Chrome and Safari helps illustrate the issue. I've only reproduced this bug on my machine, a 2021 14" MBP.

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