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P2Important issues not at the top of the work listc: performanceRelates to speed or footprint issues (see "perf:" labels)f: scrollingViewports, list views, slivers, etc.found in release: 3.19Found to occur in 3.19found in release: 3.22Found to occur in 3.22frameworkflutter/packages/flutter repository. See also f: labels.has reproducible stepsThe issue has been confirmed reproducible and is ready to work onperf: speedPerformance issues related to (mostly rendering) speedteam-frameworkOwned by Framework teamtriaged-frameworkTriaged by Framework team
Description
Open the below project on MacOS and try using the scrollbar to jump halfway down the list.
https://gist.github.com/ryanknauer/d8361c0e59ffd51f77b735ea8698714d
Expected: Smooth scrolling.
Actual: Freezes for multiple seconds.
This issue does not occur on Linux or Web. Also note that the above is using a fixed itemExtent so this is just an issue of laying out onscreen text as the user scrolls.
Target Platform: MacOS
Target OS version/browser: Catalina 10.15.7
Devices: Macbook Pro
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P2Important issues not at the top of the work listc: performanceRelates to speed or footprint issues (see "perf:" labels)f: scrollingViewports, list views, slivers, etc.found in release: 3.19Found to occur in 3.19found in release: 3.22Found to occur in 3.22frameworkflutter/packages/flutter repository. See also f: labels.has reproducible stepsThe issue has been confirmed reproducible and is ready to work onperf: speedPerformance issues related to (mostly rendering) speedteam-frameworkOwned by Framework teamtriaged-frameworkTriaged by Framework team