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How can I reduce my website's First Input Delay (FID) score?

Asked on Nov 10, 2025

Answer

To reduce your website's First Input Delay (FID) score, focus on optimizing the main thread work and minimizing JavaScript execution time. FID measures the time from when a user first interacts with your site to the time when the browser can respond to that interaction.

Example Concept: FID is improved by breaking up long JavaScript tasks, deferring non-essential scripts, and using web workers to offload heavy computations. This ensures the main thread is available to handle user interactions promptly.

Additional Comment:

Use code-splitting to load only necessary JavaScript for the initial page load.
Implement lazy loading for non-critical resources to reduce initial load time.
Consider using the "async" or "defer" attributes for script tags to prevent blocking the main thread.
Analyze and optimize third-party scripts that may contribute to FID delays.
Regularly test your site with tools like Lighthouse to identify and address FID issues.

✅ Answered with Core Web Vitals best practices.

Ask any question about Performance here... and get an instant response.

How can I reduce my website's First Input Delay (FID) score?

Asked on Nov 10, 2025

Answer

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