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regression: impeller windows transition caused startup regression #188338

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@gaaclarke

This may be expected as we are doing more upfront shader compilation at startup and the times recorded may not be reflective of what one would see on a real device since things may be emulated with swiftshader or run through ANGLE.

benchmark

https://flutter-flutter-perf.luci.app/e/?begin=1781791888&end=1782150918&keys=X59097f1d646c5de03b5e6dae528a8059&num_commits=50&request_type=1&xbaroffset=2808410

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    P1High-priority issues at the top of the work listc: performanceRelates to speed or footprint issues (see "perf:" labels)e: impellerImpeller rendering backend issues and features requestsplatform-windowsBuilding on or for Windows specificallyteam-engineOwned by Engine teamtriaged-engineTriaged by Engine team

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