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Transition performance regressed slightly due to OpacityLayer raster cache miss #52864

@liyuqian

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@liyuqian

The regression is introduced by flutter/engine#14024 around 12/4/2019 on flutter_gallery__transition_perf average_frame_rasterizer_time_millis. It's small so it didn't turn the graph red:

Screen Shot 2020-03-18 at 4 53 29 PM

@flar first noticed this issue while he was working on ImageFilteredLayer and he's working on a fix flutter/engine#17175

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P3Issues that are less important to the Flutter projectc: performanceRelates to speed or footprint issues (see "perf:" labels)c: regressionIt was better in the past than it is nowengineflutter/engine repository. See also e: labels.perf: speedPerformance issues related to (mostly rendering) speed

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