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This pull request is created by [automatic cherry pick workflow](https://github.com/flutter/flutter/blob/main/docs/releases/Flutter-Cherrypick-Process.md#automatically-creates-a-cherry-pick-request) ### Issue Link: https://github.com/flutter/flutter/issues/166905 ### Changelog Description: * [flutter/166905](https://github.com/flutter/flutter/issues/166905) Fixes a performance regression in skwasm when running in single-threaded mode. ### Impact Description: This fixes a significant regression in the skwasm renderer when running single-thraaded (i.e. in a non-`crossOriginIsolated` browsing context) ### Workaround: Is there a workaround for this issue? The only workaround is to run skwasm in a multi-threaded context or to disable skwasm. ### Risk: What is the risk level of this cherry-pick? - [ x ] Low This essentially returns the single-threaded renderer to the previous message passing strategy. ### Test Coverage: Are you confident that your fix is well-tested by automated tests? - [ x ] Yes ### Validation Steps: What are the steps to validate that this fix works? Built the Wonderous app and take a Chrome profile.
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