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Notes on shipping fast without getting slow.

Guides on Core Web Vitals, what we learn measuring real releases, and how we’re building CodeGecko.

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Before vs after

Slower since Tuesday.

FeaturedGuidesDid my deploy slow down my site? How to know for sureOne Lighthouse run can’t tell you, and neither can a week-over-week chart. Here’s how to compare a release with the one before it, using real visits, and how big a change has to be before it’s real.Nour7 min read ·

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CodeGecko checks every release against real-user data and tells you if it made your site slower. Early access is opening to a first group of teams.

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