FID (First Input Delay)
How long your site takes to respond the first time a visitor taps or clicks something after the page loads.
Definition
FID, or First Input Delay, measures the gap between when a visitor first interacts with your page, such as tapping a menu button, and when the browser actually responds. Good FID is under 100 milliseconds. If your site is busy loading heavy scripts in the background, that tap feels frozen, and visitors assume the site is broken. Google has now replaced FID with INP as the official Core Web Vital in 2024, but FID is still useful for diagnosing why a page feels sluggish on first interaction. The fix is usually reducing JavaScript and deferring third-party scripts. See pricing for cleanups.
Why it matters in Miami
Miami small businesses often load chat widgets, Facebook pixels, and tag managers all at once, killing FID on mobile. Trimming these scripts is essential for bilingual sites already loading translation logic.
Example
A Little Havana law firm's site had a 380ms FID because of seven marketing scripts firing at once; consolidating them through Google Tag Manager cut FID to 60ms.
Related terms
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