# Fixing your website's JavaScript performance

DevFeed: [Fixing your website's JavaScript performance](<https://devfeed.tech/articles/fixing-your-website-s-javascript-performance-4051.md>)

Original publisher: [Read original article](<https://developer.mozilla.org/en-US/blog/fix-javascript-performance/>)

Author: debugbear

Published: 2024-10-09T00:00:00Z

Content type: tutorial

Language: en

Sources: [MDN Blog](<https://devfeed.tech/sources/mdn-blog.md>)

Topics: [modern web development](<https://devfeed.tech/topics/modern-web-development.md>), [Web platform](<https://devfeed.tech/topics/web-platform.md>), [interactive website](<https://devfeed.tech/topics/interactive-website.md>)

Tags: [browser](<https://devfeed.tech/tags/browser.md>), [javascript](<https://devfeed.tech/tags/javascript.md>), [next-js](<https://devfeed.tech/tags/next-js.md>), [optimization](<https://devfeed.tech/tags/optimization.md>), [payload](<https://devfeed.tech/tags/payload.md>), [performance](<https://devfeed.tech/tags/performance.md>), [user-interfaces](<https://devfeed.tech/tags/user-interfaces.md>), [web](<https://devfeed.tech/tags/web.md>)

## AI overview

The article explains JavaScript-related web performance bottlenecks: long main-thread tasks, large bundles, and client-side hydration. It shows how slow parsing and execution can leave server-rendered content visible but temporarily unresponsive.

## Source excerpt

Learn about lesser-known web performance bottlenecks connected to excessive JavaScript usage, like long tasks, large bundle sizes, and hydration issues.