Vite 8 Beta With Rolldown: The Rust Bundler That Promises 10x Faster Builds

Hello HaWkers, one of the most anticipated news in the JavaScript ecosystem has finally arrived. Vite 8 beta was released with Rolldown, a bundler written entirely in Rust that replaces the dual esbuild/Rollup architecture. Early tests show production builds dropping from 46 seconds to just 6 seconds.

Are you ready to experience the next generation of JavaScript bundlers?

What Changed in Vite 8

Vite has always been known for its impressive development speed. However, production builds still relied on Rollup, which is written in JavaScript. With Vite 8, this changes completely.

Previous Architecture (Vite 7)

Development:

esbuild for module transformation
Native ESM dev server
Ultra-fast Hot Module Replacement

Production:

Rollup for bundling
Rollup plugins for optimizations
Slower due to JavaScript

New Architecture (Vite 8)

Development and Production:

Rolldown for everything
Written 100% in Rust
Rollup plugin compatibility
Consistent performance in both modes

Impressive Benchmarks

The numbers from Vite 8 with Rolldown are surprising.

Build Comparison

Project	Vite 7 (Rollup)	Vite 8 (Rolldown)	Improvement
Small app (100 modules)	8s	1.2s	6.7x
Medium app (500 modules)	25s	3.5s	7.1x
Large app (2000 modules)	46s	6s	7.7x
Monorepo (5000 modules)	120s	14s	8.6x

Memory Usage

Scenario	Vite 7	Vite 8	Reduction
Small build	512MB	180MB	65%
Large build	2.5GB	650MB	74%
Dev server idle	150MB	80MB	47%

💡 Context: In July 2025, Vite's weekly downloads surpassed Webpack for the first time, consolidating its position as the most popular bundler.

How Rolldown Works

Rolldown is a Rust bundler that replicates Rollup's API, allowing compatibility with the existing ecosystem.

Main Features

// vite.config.js - Vite 8 with Rolldown
import { defineConfig } from 'vite';
import react from '@vitejs/plugin-react';

export default defineConfig({
  plugins: [react()],

  // Rolldown is enabled by default in Vite 8
  build: {
    // Rollup plugins continue to work
    rollupOptions: {
      output: {
        manualChunks: {
          vendor: ['react', 'react-dom'],
        },
      },
    },
  },
});

Plugin Compatibility

// Existing Rollup plugins work without modification
import commonjs from '@rollup/plugin-commonjs';
import resolve from '@rollup/plugin-node-resolve';
import terser from '@rollup/plugin-terser';

export default defineConfig({
  plugins: [
    // Vite plugins
    react(),
  ],
  build: {
    rollupOptions: {
      plugins: [
        // Traditional Rollup plugins
        commonjs(),
        resolve(),
        terser(),
      ],
    },
  },
});

Migration from Vite 7 to Vite 8

The migration was designed to be as simple as possible.

Step by Step

1. Update dependencies:

# npm
npm install vite@8.0.0-beta.1

# yarn
yarn add vite@8.0.0-beta.1

# pnpm
pnpm add vite@8.0.0-beta.1

2. Check plugin compatibility:

// Most plugins work without changes
// Check console for warnings

// Plugins that may need updates:
// - Plugins that access Rollup internals
// - Plugins with native code
// - Very old plugins

3. Test the build:

# Run test build
vite build

# Compare output with previous version
# Check if chunks are similar

Known Breaking Changes

Minor changes:

Order of some hooks may vary
Sourcemaps may have small differences
Some warnings may be different

What stays the same:

Vite API
vite.config.js configuration
Official Vite plugins
Most community plugins

Why Rust Makes a Difference

The choice of Rust for Rolldown was not accidental. The language offers fundamental advantages for bundlers.

Rust Advantages

Performance:

Compilation to native code
No garbage collection overhead
Efficient parallelization with guaranteed safety
Zero-cost abstractions

Reliability:

Compile-time memory safety
No null pointer exceptions
Guaranteed thread safety
Fewer bugs in production

Comparison with JavaScript

// Rust: safe parallel processing
use rayon::prelude::*;

fn process_modules(modules: &[Module]) -> Vec<ProcessedModule> {
    modules
        .par_iter() // Automatically parallel
        .map(|m| process_module(m))
        .collect()
}

// JavaScript: parallelism is complicated
async function processModules(modules) {
  // Worker threads are complex
  // Shared memory is dangerous
  // Promise.all has limitations
  return Promise.all(modules.map(processModule));
}

Impact on the Ecosystem

Rolldown's success signals a larger trend in the JavaScript ecosystem.

JavaScript Tools in Rust

Tool	Replaces	Status
Rolldown	Rollup	Beta (Vite 8)
oxc	ESLint/Babel	In development
Biome	ESLint + Prettier	Stable
SWC	Babel	Stable
Turbopack	Webpack	In development

How to Try Today

If you want to test Vite 8 with Rolldown, follow these steps.

Installation

# Create new project with Vite 8 beta
npm create vite@latest my-app -- --template react

# Navigate to project
cd my-app

# Update to Vite 8 beta
npm install vite@8.0.0-beta.1

# Start development
npm run dev

# Test production build
npm run build

Compare Performance

# Install benchmark tool
npm install -D hyperfine

# Compare builds (requires Vite 7 installed in another project)
hyperfine --warmup 3 \
  'cd vite7-project && npm run build' \
  'cd vite8-project && npm run build'

Conclusion

Vite 8 with Rolldown represents a milestone in the evolution of JavaScript tools. 10x faster production builds are not just a convenience—they mean faster iterations, more efficient CI/CD, and more productive developers.

If you already use Vite, migrating to version 8 will be virtually transparent. If you don't yet, this is an excellent time to start.

If you want to understand more about how Rust is revolutionizing the JavaScript ecosystem, I recommend checking out our article on VoidZero and Vite Plus where we discuss the complete vision of this new toolchain.