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csswizardry.com
📖 Making Sense of the Performance Extensibility API

csswizardry.com/2025/07/the-...
Making Sense of the Performance Extensibility API – CSS Wizardry
Making sense—and use!—of the new Performance Extensibility API in Chrome DevTools.
csswizardry.com
July 25, 2025 at 2:22 PM
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jackf.io
Really awesome blog post! The perf extensibility API is really cool (although I am biased...) and worth your time to add custom data to the performance traces on your sites.

Also, the issue Harry mentions where marks don't show timestamps is absolutely a bug, and will be fixed in Chrome M140.
July 25, 2025 at 4:07 PM