Core Web Vitals
FID (First Input Delay)
Measures the time from first user interaction to browser response.
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What is FID (First Input Delay)
First Input Delay (FID) measures the time between when a user first interacts with your page (clicks, taps, presses a key) and when the browser can respond. It indicates how responsive your page feels.
Example
Good: <100ms, Needs Improvement: 100-300ms, Poor: >300ms. If you click a button and nothing happens for 500ms, that's poor FID.
How to apply it
Minimize JavaScript execution, break up long tasks, use web workers, defer non-critical JavaScript, remove unused code, reduce third-party script impact.
Tip:FID is being replaced by INP (Interaction to Next Paint). Start measuring INP now as it will become the primary responsiveness metric.
Track it in GSC Boost
GSC Boost reads your Search Console data and tells you what to fix first, with the clicks each fix is likely to bring. Start with the guide or sign up free.
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