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How can I reduce JavaScript execution time to improve overall page performance?

Asked on Dec 14, 2025

Answer

Reducing JavaScript execution time is crucial for improving overall page performance, as it directly impacts metrics like First Input Delay (FID) and Total Blocking Time (TBT). Optimizing JavaScript can lead to faster interactivity and a smoother user experience.

<!-- BEGIN COPY / PASTE -->
    <script src="script.js" async></script>
    <!-- END COPY / PASTE -->

Additional Comment:

Use "async" or "defer" attributes on script tags to prevent blocking the initial page load.
Minimize and bundle JavaScript files to reduce their size and number of requests.
Identify and remove unused JavaScript using tools like Chrome DevTools Coverage tab.
Consider code splitting to load only necessary JavaScript for the initial page view.
Utilize web workers for heavy computations to keep the main thread free.

✅ Answered with Core Web Vitals best practices.

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

How can I reduce JavaScript execution time to improve overall page performance?

Asked on Dec 14, 2025

Answer

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