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docs: 4.3 announcement and release notes (#12925)
Co-authored-by: 翠 / green <green@sapphi.red>
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docs/blog/announcing-vite4-3.md
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---
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sidebar: false
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head:
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- - meta
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content: website
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content: Announcing Vite 4.3
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content: https://vitejs.dev/og-image-announcing-vite4-3.png
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content: https://vitejs.dev/blog/announcing-vite4-3
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content: Vite 4.3 Release Announcement
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content: summary_large_image
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---
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# Vite 4.3 is out!
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_April 20, 2023_
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Quick links:
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- Docs: [English](/), [简体中文](https://cn.vitejs.dev/), [日本語](https://ja.vitejs.dev/), [Español](https://es.vitejs.dev/), [Português](https://pt.vitejs.dev/)
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- [Vite 4.3 Changelog](https://github.com/vitejs/vite/blob/main/packages/vite/CHANGELOG.md#430-2023-04-20)
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## Performance Improvements
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In this minor, we focused on improving the dev server performance. The resolve logic got streamlined, improving hot paths and implementing smarter caching for finding `package.json`, TS config files, and resolved URL in general.
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You can read a detailed walkthrough of the performance work done in this blog post by one of Vite Contributors: [How we made Vite 4.3 faaaaster 🚀](https://sun0day.github.io/blog/vite/why-vite4_3-is-faster.html).
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This sprint resulted in speed improvements across the board compared to Vite 4.2.
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These are the performance improvements as measured by [sapphi-red/performance-compare](https://github.com/sapphi-red/performance-compare), which tests an app with 1000 React Components cold and warm dev server startup time as well as HMR times for a root and a leaf component:
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| **Vite (babel)** | Vite 4.2 | Vite 4.3 | Improvement |
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| :----------------- | --------: | -------: | ----------: |
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| **dev cold start** | 17249.0ms | 5132.4ms | -70.2% |
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| **dev warm start** | 6027.8ms | 4536.1ms | -24.7% |
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| **Root HMR** | 46.8ms | 26.7ms | -42.9% |
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| **Leaf HMR** | 27.0ms | 12.9ms | -52.2% |
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| **Vite (swc)** | Vite 4.2 | Vite 4.3 | Improvement |
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| :----------------- | --------: | -------: | ----------: |
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| **dev cold start** | 13552.5ms | 3201.0ms | -76.4% |
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| **dev warm start** | 4625.5ms | 2834.4ms | -38.7% |
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| **Root HMR** | 30.5ms | 24.0ms | -21.3% |
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| **Leaf HMR** | 16.9ms | 10.0ms | -40.8% |
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You can read more information about the benchmark [here](https://gist.github.com/sapphi-red/25be97327ee64a3c1dce793444afdf6e). Specs and Versions for this performance run:
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- CPU: Ryzen 9 5900X, Memory: DDR4-3600 32GB, SSD: WD Blue SN550 NVME SSD
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- Windows 10 Pro 21H2 19044.2846
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- Node.js 18.16.0
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- Vite and React Plugin versions
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- Vite 4.2 (babel): Vite 4.2.1 + plugin-react 3.1.0
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- Vite 4.3 (babel): Vite 4.3.0 + plugin-react 4.0.0-beta.1
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- Vite 4.2 (swc): Vite 4.2.1 + plugin-react-swc 3.2.0
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- Vite 4.3 (swc): Vite 4.3.0 + plugin-react-swc 3.3.0
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Early adopters have also reported seeing 1.5x-2x dev startup time improvement on real apps while testing the Vite 4.3 beta. We'd love to know the results for your apps.
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## Profiling
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We'll continue to work on Vite's performance. We're working on an official [Benchmark tool](https://github.com/vitejs/vite-benchmark) for Vite that let us get performance metrics for each Pull Request.
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And [vite-plugin-inspect](https://github.com/antfu/vite-plugin-inspect) now has more performance-related features to help you identify which plugins or middlewares are the bottleneck for your applications.
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Using `vite --profile` (and then pressing `p`) once the page loads will save a CPU profile of the dev server startup. You can open them in an app as [speedscope](https://www.speedscope.app/) to identify performance issues. And you can share your findings with the Vite Team in a [Discussion](https://github.com/vitejs/vite/discussions) or in [Vite's Discord](https://chat.vitejs.dev).
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## Next Steps
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We decided to do a single Vite Major this year aligning with the [EOL of Node.js 16](https://endoflife.date/nodejs) in September, dropping support for both Node.js 14 and 16 in it. If you would like to get involved, we started a [Vite 5 Discussion](https://github.com/vitejs/vite/discussions/12466) to gather early feedback.
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## 4.3.0 (2023-04-20)
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Vite 4.3 is out!
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Vite 4.3 is out! Read the [announcement blog post here](https://vitejs.dev/blog/announcing-vite4-3)
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[)](https://vitejs.dev/blog/announcing-vite4-3)
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In this minor, we focused on improving the dev server performance. The resolve logic got streamlined, improving hot paths and implementing smarter caching for finding `package.json`, TS config files, and resolved URL in general.
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You can read a detailed walkthrough of the performance work done in this blog post by one of Vite Contributors: [How we made Vite 4.3 faaaaster 🚀](https://sun0day.github.io/blog/vite/why-vite4_3-is-faster.html).
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This sprint resulted in speed improvements across the board compared to Vite 4.2.
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These are the performance improvements as measured by [sapphi-red/performance-compare](https://github.com/sapphi-red/performance-compare), which tests an app with 1000 React Components cold and warm dev server startup time as well as HMR times for a root and a leaf component:
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| **Vite (babel)** | Vite 4.2 | Vite 4.3 | Improvement |
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| :----------------- | --------: | -------: | -----------: |
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| **dev cold start** | 17249.0ms | 5132.4ms | -70.2% |
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| **dev warm start** | 6027.8ms | 4536.1ms | -24.7% |
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| **Root HMR** | 46.8ms | 26.7ms | -42.9% |
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| **Leaf HMR** | 27.0ms | 12.9ms | -52.2% |
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| **Vite (swc)** | Vite 4.2 | Vite 4.3 | Improvement |
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| :----------------- | --------: | -------: | -----------: |
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| **dev cold start** | 13552.5ms | 3201.0ms | -76.4% |
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| **dev warm start** | 4625.5ms | 2834.4ms | -38.7% |
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| **Root HMR** | 30.5ms | 24.0ms | -21.3% |
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| **Leaf HMR** | 16.9ms | 10.0ms | -40.8% |
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You can read more information about the benchmark [here](https://gist.github.com/sapphi-red/25be97327ee64a3c1dce793444afdf6e)
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### Features
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