Rspack vs Vite vs Turbopack: Best JavaScript Bundler (2026)

The JavaScript bundler wars have a new chapter. Vite dominates mindshare, Turbopack powers Next.js, and Rspack is the webpack-compatible Rust bundler gaining serious traction. Here's how they compare.

Quick Comparison

Feature	Rspack	Vite	Turbopack
Language	Rust	JavaScript + Rust (Rollup/esbuild)	Rust
Dev server	Bundled (fast)	Unbundled (native ESM)	Bundled (fast)
HMR speed	~10ms	~20-50ms	~10ms
Production build	Built-in (Rust)	Rollup (switching to Rolldown)	Not yet stable for prod
webpack compat	~90% plugin/loader API	None (different API)	Partial
Config	webpack-like	vite.config.ts	next.config.js
Framework	Any (+ Rsbuild)	Any (native integrations)	Next.js only
CSS	Built-in (Lightning CSS)	PostCSS/Lightning CSS	Built-in
Tree shaking	Yes	Yes (Rollup)	Yes
Code splitting	Yes	Yes	Yes

Rspack: The Webpack Successor

Rspack is a Rust-based bundler with near-complete webpack API compatibility. Built by ByteDance (TikTok), it's designed as a drop-in webpack replacement that's 5-10x faster.

Strengths

webpack compatibility. Most webpack loaders and plugins work with Rspack. Migration from webpack can be as simple as changing your config file import.

Build speed. Rust-powered parallelization delivers 5-10x faster builds than webpack. A project that takes 60 seconds with webpack might take 8 seconds with Rspack.

Rsbuild. Rspack's higher-level build tool (like Vite but on Rspack). Zero-config setup for React, Vue, Svelte with sensible defaults.

Production-ready. Unlike Turbopack, Rspack handles both dev and production builds. Used in production at ByteDance serving billions of users.

Module Federation 2.0. First-class support for micro-frontends via Module Federation. Critical for large organizations with multiple teams.

Weaknesses

• Smaller community than Vite
• Documentation still maturing (improving rapidly)
• Some webpack plugins need minor adjustments
• Less ecosystem tooling (fewer starter templates, guides)
• ByteDance dependency (though it's open-source MIT)

Best For

Teams migrating from webpack who want speed without rewriting config. Large monorepos. Micro-frontend architectures using Module Federation.

Vite: The Developer Experience King

Vite changed how developers think about build tools. Its unbundled dev server and instant HMR made it the default choice for new projects.

Strengths

Developer experience. npm create vite@latest → working project in 30 seconds. The best getting-started experience in the ecosystem.

Unbundled dev server. Serves source files as native ES modules. Only transforms what the browser requests. Startup is near-instant regardless of project size.

Framework ecosystem. Official templates for React, Vue, Svelte, Solid, Lit, and Preact. First-class support from every major framework.

Plugin API. Clean, well-designed plugin API based on Rollup. Huge plugin ecosystem covering every use case.

Rolldown (coming). Vite is moving to Rolldown (Rust-based Rollup) for production builds, unifying dev and prod into one fast toolchain.

Community. Largest community of any modern bundler. Most npm packages now ship Vite-compatible configs.

Weaknesses

• Dev/prod mismatch (ESM dev server vs Rollup production — being addressed by Rolldown)
• Large dependency trees can slow initial dev server startup
• Production builds with Rollup are slower than Rspack/Turbopack
• No webpack loader/plugin compatibility
• Unbundled dev can have waterfall request issues for large projects

Best For

New projects of any framework. The default choice when you don't have specific requirements pushing you elsewhere. Best plugin ecosystem and community.

Turbopack: Next.js Native

Turbopack is Vercel's Rust-based bundler built specifically for Next.js. Created by Tobias Koppers (webpack's creator), it's designed for the Next.js architecture.

Strengths

Next.js integration. Zero-config for Next.js projects. next dev --turbo and you're using Turbopack. Deeply integrated with Next.js features (App Router, Server Components, etc.).

Incremental computation. Turbopack's architecture caches computation at a granular level. After the first build, subsequent changes rebuild only what changed.

HMR speed. Sub-10ms hot module replacement in large projects. Consistent speed regardless of project size.

Server Components. Purpose-built for React Server Components, the model Next.js is built around.

Weaknesses

• Next.js only. Not usable outside Next.js (by design, at least for now).
• Production builds still stabilizing. Dev mode is mature, but production builds via Turbopack are relatively new.
• No plugin API. You can't extend Turbopack with custom plugins. What it does, it does well — but you can't customize beyond Next.js's built-in options.
• Closed ecosystem. If you leave Next.js, you leave Turbopack.
• Webpack config migration. Not all webpack config options in next.config.js translate to Turbopack.

Best For

Next.js projects. If you're using Next.js, Turbopack is the obvious choice for dev server performance.

Performance Benchmarks

Dev Server Cold Start (Large React App)

Bundler	Cold Start
webpack 5	30-60s
Vite	1-3s
Rspack	2-5s
Turbopack	2-4s

Vite's unbundled approach gives it the fastest cold start. Rspack and Turbopack are close behind.

HMR (Single File Change)

Bundler	HMR Time
webpack 5	200-1000ms
Vite	20-50ms
Rspack	10-30ms
Turbopack	5-20ms

All three modern bundlers deliver near-instant HMR. The differences are barely perceptible to humans.

Production Build (Large App)

Bundler	Build Time
webpack 5	60-120s
Vite (Rollup)	30-60s
Rspack	8-15s
Turbopack	10-20s (maturing)

Rspack wins production builds decisively right now. Vite's Rolldown will close this gap.

Migration Guide

From webpack → Rspack

1. Install Rspack: npm install @rspack/core @rspack/cli
2. Rename webpack.config.js → rspack.config.js
3. Change imports from webpack to @rspack/core
4. Test — most configs work unchanged
5. Replace incompatible loaders with Rspack built-ins (e.g., built-in CSS, asset handling)

Effort: Low. Hours to days depending on custom plugin complexity.

From webpack → Vite

1. Rewrite config from scratch (different API)
2. Replace webpack loaders with Vite plugins
3. Update import patterns (no require(), use ESM)
4. Migrate environment variables (VITE_ prefix)
5. Update build scripts

Effort: Moderate. Days to weeks depending on project size.

From Create React App → Any

All three are massive upgrades from CRA. Vite has the smoothest migration path for CRA projects.

Decision Framework

Choose Rspack if:

• You're migrating from webpack (minimal changes needed)
• You need Module Federation for micro-frontends
• Production build speed is critical
• You're in a large organization with webpack infrastructure

Choose Vite if:

• You're starting a new project (any framework)
• You want the largest ecosystem and community
• Developer experience is the top priority
• You're using Vue, Svelte, or Solid (first-class Vite citizens)

Choose Turbopack if:

• You're using Next.js (it's the default)
• You don't need custom bundler plugins
• You want zero-config with optimal Next.js performance

FAQ

Is webpack dead?

Not dead, but declining. webpack 5 is in maintenance mode. New projects should choose Vite, Rspack, or Turbopack. Existing webpack projects should consider migrating to Rspack (easiest path).

Will Vite's Rolldown make Rspack irrelevant?

Possibly for new projects. Rolldown will give Vite Rust-speed production builds. But Rspack's webpack compatibility remains uniquely valuable for migrations and Module Federation.

Can I use Turbopack outside Next.js?

Not practically, and Vercel hasn't indicated plans to make it framework-agnostic. It's deeply coupled to Next.js's architecture.

Which is best for a monorepo?

Rspack (with Module Federation) or Vite (with good monorepo support). Turbopack works for Next.js monorepos specifically.

The Verdict

• Vite remains the default choice for new projects in 2026. Best ecosystem, best DX, and Rolldown will solve the production build speed gap.
• Rspack is the clear winner for webpack migrations and large organizations. 5-10x faster builds with minimal config changes.
• Turbopack is the right choice if you're using Next.js. Just enable it and enjoy faster dev server performance.

For most developers: use Vite. If you're on Next.js: use Turbopack. If you're migrating from webpack: use Rspack.