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20% regression in platform channels benchmark #138689

@zanderso

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@zanderso

On the engine roll #138647, SkiaPerf is reporting a ~20% regression in the platform_channel_basic_standard_2host_large metric from the platform_channels_benchmarks benchmark:

https://flutter-flutter-perf.skia.org/e/?begin=1700183293&end=1700312483&keys=X25251bae98644a72a9a678545659f5cc&num_commits=50&request_type=1&xbaroffset=38025

That Engine -> Dart roll has a Dart SDK roll (flutter/engine#48187), and from that roll, the following commit looks like it could be related:

https://dart.googlesource.com/sdk.git/+/904354f108818630c98ef5d019bc0a99e1c6f2fd

cc @gaaclarke @sstrickl @mkustermann

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P1High-priority issues at the top of the work listc: performanceRelates to speed or footprint issues (see "perf:" labels)dependency: dartDart team may need to help usteam-engineOwned by Engine teamtriaged-engineTriaged by Engine team

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