[CPU Profiler] Delete the "Profile app start up" button#9358
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derekxu16 merged 1 commit intoflutter:masterfrom Aug 6, 2025
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| tooltip: | ||
| 'Load all Dart CPU samples that occurred before \n' | ||
| 'the first Flutter frame was drawn (if available)', | ||
| 'This button is deprecated. The new procedure for profiling an' |
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Instead of deprecating the button, I think it would be better to remove it entirely (and update the website docs on CPU profiling to call out this flag)
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Sounds good. I've updated this PR, and opened flutter/website#12272 to update the website.
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For context: the VM team has learned that the implementation of CPU sample streaming in the VM can sometimes cause it to crash. We have concluded that the best way to proceed is by removing support for CPU sample streaming from the VM. Removing support for CPU sample streaming will mean that DevTools will no longer be able to use that support for its "Profile app start up" feature. We discussed this with @kenzieschmoll, and she approved of the plan to have users pass the
--profile-startupDart CLI flag or Flutter CLI flag instead when they want to see startup CPU samples.