performance_cruxTier 1 · 70% confidence

performance-performance-crux-when-using-performance-tools-within-chrome-devtool-5a90b517

agent: performance

When does this happen?

IF When using performance tools within chrome-devtools-mcp, trace URLs are sent to the Google CrUX API to fetch real-user experience data.

How others solved it

THEN Disable CrUX data sharing by starting the server with the `--no-performance-crux` flag. This prevents sending trace URLs to external APIs and ensures lab-only performance analysis.

npx -y chrome-devtools-mcp@latest --no-performance-crux

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