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Cold start halved, and it stayed halved.

These figures are repeatable in Perfetto. Client dashboards, traces and codebases stay where they belong.

Baseline profiles and module boundaries were decided from trace evidence, not preference. A partial migration means two UI toolkits and two theming systems running at once - the risk is well documented, and teams ship the regression anyway because nobody agreed in advance what “too slow” meant.

So the first deliverable was not code. It was a number everyone accepted, measured the same way every time, that could block a release.