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Notifcation API is expensive #97849

@jonahwilliams

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@jonahwilliams

From some early investigation, several of the scroll notification events have no listeners if there is no scroll bar, which leads to 500/1000 element traversals and 2x-3x as many typechecks per frame on gallery Shrine/ mobile.

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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.frameworkflutter/packages/flutter repository. See also f: labels.

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