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Some animated custom emoji play far faster on mobile than on desktop. Browsers show any animation frame with a delay of 10 ms or less for 100 ms. Firefox started this ([bug 207059](https://bugzilla.mozilla.org/show_bug.cgi?id=207059)). Chromium copied it (decoder comment: "use a duration of 100 ms for any frames that specify a duration of <= 10 ms"), and so did WebKit ([changeset 73295](https://trac.webkit.org/changeset/73295/webkit)). Flutter uses the delay as written ([flutter/flutter#130684](https://github.com/flutter/flutter/issues/130684)), so a GIF with 0 or 1 centisecond delays runs at the display refresh rate on mobile and at 10 fps on desktop. `MediaImageProvider` now wraps multi-frame codecs so frames of 10 ms or less get 100 ms. Every other frame keeps its own delay. Still images are passed through unchanged. Custom emoji, avatars and attachments all render through this provider. **Tests:** `flutter test test/shared/relay/media_image_test.dart` passes (24/24), and `flutter analyze` reports no issues on the changed files. The new test decodes a GIF with delays of 0, 1, 2 and 5 cs and expects 100, 100, 20 and 50 ms. It fails when the wrapper is removed. 🤖 Generated with [Claude Code](https://claude.com/claude-code) Signed-off-by: Kalvin Chau <kalvin@block.xyz> Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>