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test(studio): inject a 45 ms stall per timeline scroll step to prove the gate fails it - #4848

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miguel-heygen wants to merge 2 commits into
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test/viewport-gate-injected-delay
Closed

miguel-heygen wants to merge 2 commits into
mainfrom
test/viewport-gate-injected-delay

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@miguel-heygen

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Do not merge. A sensitivity check for #4847: this branch adds a fixed 45 ms main-thread stall to every timeline scroll step, so the timeline viewport gate must fail it on both arms. It will be closed once CI has run.

@miguel-heygen

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Sensitivity check done: with the 45 ms stall, the rollback arm's pooled p95 reached 89.0 ms and the gate failed it (run 36845468494). Numbers are in #4847.

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miguel-heygen deleted the test/viewport-gate-injected-delay branch October 1, 2026 10:04
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github-actions Bot commented Oct 1, 2026

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Edit accuracy: 530 passing here, 530 on the base branch

The gate passes.
Smoothness is reported in the artifact, not gated. A case fails only if it fails 2 of 3 runs.

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