---
title: "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
source_url: https://medium.com/insiderengineering/javascript-performance-optimization-with-vite-rollupjs-587d2cbf1979?source=rss------javascript-5
type: article
source: "Medium"
published: 2023-09-25T21:17:49.276Z
updated: 2023-09-25T07:17:25.641Z
tags: ["javascript", "performance", "frontend", "webpack", "vite", "lighthouse"]
reading_time: 3
upvotes: 0
comments: 0
language: 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: <https://medium.com/insiderengineering/javascript-performance-optimization-with-vite-rollupjs-587d2cbf1979?source=rss------javascript-5>

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---

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)