--- title: Unlocking the Power of JavaScript: Reduce Your NPM... description: JS Performance Optimization with Vite and Rollupjs. We improved Lighthouse metrics from 38% to 82% and reduced FCP (First Contentful Paint) time from 5.7... canonical: https://daily.dev/posts/unlocking-the-power-of-javascript-reduce-your-npm-package-size-by-99--x8dd34f8r twitter:card: summary_large_image twitter:site: @dailydotdev og:type: website og:site_name: daily.dev og:title: Unlocking the Power of JavaScript: Reduce Your NPM Package Size by 99% | daily.dev og:description: JS Performance Optimization with Vite and Rollupjs. We improved Lighthouse metrics from 38% to 82% and reduced FCP (First Contentful Paint) time from 5.7... og:url: https://daily.dev/posts/unlocking-the-power-of-javascript-reduce-your-npm-package-size-by-99--x8dd34f8r og:image: https://api.daily.dev/og/posts/X8dD34f8r.png og:image:alt: Unlocking the Power of JavaScript: Reduce Your NPM Package Size by 99% og:image:width: 1200 og:image:height: 630 og:locale: en --- > ## Documentation Index > Fetch the complete documentation index at: https://daily.dev/llms.txt > Use this file to discover all available pages before exploring further. # Unlocking the Power of JavaScript: Reduce Your NPM Package Size by 99% **[Medium](https://daily.dev/sources/medium_js)** · 3 min read · 0 upvotes · 0 comments ## Summary JS Performance Optimization with Vite and Rollupjs. We improved Lighthouse metrics from 38% to 82% and reduced FCP (First Contentful Paint) time from 5.7 seconds to around 1.0~1. 7 seconds in projects where we use the Design System package. Vite can start the development server quickly, allowing you to see changes instantly. ## Full article daily.dev links to this article rather than hosting it. Read it at the original source: --- Tags: [#javascript](https://daily.dev/tags/javascript), [#performance](https://daily.dev/tags/performance), [#frontend](https://daily.dev/tags/frontend), [#webpack](https://daily.dev/tags/webpack), [#vite](https://daily.dev/tags/vite), [#lighthouse](https://daily.dev/tags/lighthouse) [View this post on daily.dev](https://daily.dev/posts/unlocking-the-power-of-javascript-reduce-your-npm-package-size-by-99--x8dd34f8r) ```json {"@context":"https://schema.org","@graph":[{"@type":"Organization","@id":"https://daily.dev/#organization","name":"daily.dev","url":"https://daily.dev","logo":{"@type":"ImageObject","url":"https://daily.dev/apple-touch-icon.png","width":180,"height":180},"sameAs":["https://twitter.com/dailydotdev","https://github.com/dailydotdev","https://www.linkedin.com/company/daily-dev-ltd"]},{"@type":"WebSite","@id":"https://daily.dev/#website","url":"https://daily.dev","name":"daily.dev","publisher":{"@id":"https://daily.dev/#organization"},"potentialAction":{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https://daily.dev/search?q={search_term_string}"},"query-input":"required name=search_term_string"}}]} {"@context":"https://schema.org","@type":"TechArticle","headline":"Unlocking the Power of JavaScript: Reduce Your NPM Package Size by 99%","url":"https://daily.dev/posts/unlocking-the-power-of-javascript-reduce-your-npm-package-size-by-99--x8dd34f8r","mainEntityOfPage":{"@type":"WebPage","@id":"https://daily.dev/posts/unlocking-the-power-of-javascript-reduce-your-npm-package-size-by-99--x8dd34f8r"},"datePublished":"2023-09-25T21:17:49.276Z","dateModified":"2023-09-25T07:17:25.641Z","description":"JS Performance Optimization with Vite and Rollupjs. 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