First Input Delay (FID)
First Input Delay (FID) quantifies the responsiveness of a webpage to user interactions.
Definition
First Input Delay (FID) measures the time it takes for a website to respond to the first user interaction. Specifically, it tracks the delay between when a user first interacts with a page (like clicking a link or tapping a button) and when the browser is able to begin processing that interaction. A good FID score is under 100 milliseconds, indicating that your site is responsive and provides a fluid user experience. Poor FID can lead to frustration and increased bounce rates, as users may abandon sites that feel sluggish.
Why It Matters
FID is crucial for SEO because a low FID enhances user experience, which can lead to higher engagement and conversion rates. Google considers FID as part of its Core Web Vitals, impacting search rankings. A site with a good FID is likely to retain visitors longer, reducing bounce rates and improving overall site performance.
Example
For instance, if a user clicks a button on your website and it takes 150 milliseconds for the browser to respond, your FID is 150ms. Tools like Google Lighthouse can help you measure FID and identify areas for improvement.
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