TypeScript Bundler Performance - esbuild vs Vite vs Turbopack vs Rollup

Objective

Compare production-ready TypeScript bundlers—esbuild 0.24.0, Vite 6.0.1, Turbopack (via Next.js 15.1), and Rollup 4.27.3—across cold build time, hot module replacement (HMR), production bundle optimization, tree-shaking effectiveness, and large codebase handling.

Test Setup

Hardware & Environment

• Workstation: MacBook Pro M3 Max (14-core CPU, 36GB RAM)
• OS: macOS Sonoma 14.7
• Node.js: 22.11.0 LTS
• Disk: 2TB NVMe SSD (7.4 GB/s read)
• Network: Disabled (local-only tests)

Bundler Versions

• esbuild: 0.24.0 (standalone, no framework)
• Vite: 6.0.1 (uses esbuild for dev, Rollup for prod)
• Turbopack: Bundled with Next.js 15.1.0 (--turbo flag)
• Rollup: 4.27.3 with @rollup/plugin-typescript

Test Projects

Small App (React TypeScript SPA):

• 45 TypeScript files
• 18 React components
• 120 npm dependencies (React, React Router, Tailwind)
• Total lines of code: ~8,500
• Bundle target: ES2020, minified

Medium App (Full-stack TypeScript):

• 380 TypeScript files
• Frontend: React with 120 components
• Backend: Express API with 45 routes
• 340 npm dependencies
• Total lines of code: ~67,000
• Includes: tRPC, Prisma, Zod validation

Large Monorepo (Enterprise scale):

• 2,800 TypeScript files across 8 packages
• Shared libraries, UI components, backend services
• 890 unique npm dependencies
• Total lines of code: ~485,000
• Complex import resolution, barrel exports

Test Methodology

• Cold Build: Fresh node_modules, cleared cache, 5 runs (median reported)
• Incremental Build: Single file change, average of 50 edits
• HMR: Time from file save to browser update (50 iterations)
• Bundle Size: gzip-compressed production output
• Memory: Peak RSS during build process

All tests run with production optimizations enabled (minification, tree-shaking, code-splitting).

Cold Build Performance

Small App (8,500 LOC)

Winner: esbuild (3.3x faster than Vite, 11.4x faster than Rollup)

Medium App (67,000 LOC)

Winner: esbuild (3.7x faster than Vite, 7.6x faster than Rollup)

Note: Rollup produces slightly smaller bundles (6.5% smaller than esbuild) due to more aggressive tree-shaking.

Large Monorepo (485,000 LOC)

Winner: Turbopack (1.4x faster than esbuild, 14.4x faster than Rollup)

Analysis: Turbopack's Rust-based incremental compilation and aggressive caching shine at enterprise scale. esbuild's Go-based parallelism still impressive but Turbopack's architecture wins for massive codebases.

Hot Module Replacement (HMR)

Testing dev server responsiveness - time from file save to browser update.

Single Component Edit

*esbuild and Rollup don't have built-in dev servers; testing via esbuild-serve and rollup-plugin-serve.

Winner: Vite (2x faster than Turbopack, 3.9x faster than esbuild)

Cascading Changes (10 files affected)

Winner: Vite (20% faster than Turbopack, 2.7x faster than esbuild)

Analysis: Vite's use of native ES modules for HMR provides the fastest feedback loop. Turbopack's Rust performance can't overcome Vite's architectural advantage in dev mode.

Production Bundle Optimization

Bundle Size Comparison

Testing production output for medium app (67K LOC):

Winner: Rollup (6.5% smaller than esbuild, 1.4% smaller than Vite)

Tree-Shaking Effectiveness

Testing with lodash (only importing 5 functions):

import { debounce, throttle, cloneDeep, merge, pick } from 'lodash';

Winner: Rollup (32% smaller than esbuild for tree-shakeable libraries)

Code-Splitting Efficiency

Testing route-based code splitting (React Router, 15 routes):

Winner: Vite (19% smaller initial load than esbuild)

Analysis: Vite's Rollup-based production builds inherit excellent code-splitting. esbuild prioritizes build speed over bundle optimization.

Incremental Build Performance

Testing single TypeScript file edit in different project sizes:

Small App (45 files)

Medium App (380 files)

Large Monorepo (2,800 files)

Winner: Turbopack (2.8x faster than esbuild in large projects, 45x faster than Rollup)

Analysis: Turbopack's incremental compilation architecture and Rust-based caching provide exponential advantages as codebases scale.

TypeScript Performance

Testing pure TypeScript compilation (no bundling):

Type Checking

*esbuild doesn't type-check—only transpiles. Use tsc --noEmit separately.

**Vite and Turbopack delegate to tsc for type checking.

Transpilation Only

Winner: esbuild (raw transpilation speed)

Real-World Developer Workflow

Simulating typical dev session: start server, make 10 edits, rebuild for production.

Small App Workflow

*esbuild no HMR without extra tooling; rebuild time shown.

Medium App Workflow

Winner: Turbopack for integrated Next.js workflow

Memory Efficiency

Peak memory usage during production builds:

Winner: esbuild (24-27% less memory than competitors)

Configuration Complexity

Subjective assessment of setup difficulty:

*Turbopack requires Next.js but is zero-config within that framework.

Winner: Turbopack for zero-config, esbuild for simplicity

CSS Processing Performance

Testing Tailwind CSS compilation with PostCSS:

Small App (8,500 LOC)

*esbuild requires PostCSS plugin for Tailwind.

Winner: Vite (41% faster than esbuild)

Medium App with CSS Modules

*esbuild CSS module hashes change between builds affecting caching.

Winner: Turbopack (24% faster than Vite)

Platform Support

Interpretation

Key Findings

1. Raw Speed: esbuild is 3-11x faster for cold builds than Rollup
2. HMR Performance: Vite delivers sub-30ms HMR, 2x faster than Turbopack
3. Bundle Optimization: Rollup produces 6-7% smaller bundles than esbuild
4. Scalability: Turbopack excels at enterprise scale (485K LOC)
5. Memory Efficiency: esbuild uses 24-27% less memory than alternatives

When to Choose esbuild

✅ Maximum build speed priority (CLI tools, libraries) ✅ Simple projects without complex bundling needs ✅ Memory-constrained CI/CD environments ✅ TypeScript-only projects (no framework lock-in) ✅ Projects under 100K LOC where HMR isn't critical

When to Choose Vite

✅ Best dev experience with instant HMR ✅ Production bundle optimization important (uses Rollup) ✅ Framework-agnostic projects (React, Vue, Svelte) ✅ Small to medium apps (under 200K LOC) ✅ Teams prioritizing developer happiness

When to Choose Turbopack

✅ Large Next.js applications (200K+ LOC) ✅ Monorepos with multiple packages ✅ Enterprise teams already on Next.js/Vercel ✅ Incremental builds critical (CI/CD optimization) ✅ Projects where build speed = business value

When to Choose Rollup

✅ Library development requiring smallest bundles ✅ Advanced tree-shaking requirements ✅ Fine-grained control over output format ✅ Projects where bundle size > build speed ✅ Need for custom plugin ecosystems

Caveats

• Turbopack still beta; not all Webpack features supported
• esbuild doesn't type-check; requires separate tsc step
• Benchmarks use default configs; custom plugins affect performance
• Real-world performance varies by project structure
• Memory measurements don't include Node.js overhead

Recommendations

For new projects in 2025:

• Vite for best balance of DX and performance
• Turbopack if using Next.js and deploying to Vercel
• esbuild for maximum speed in simple setups
• Rollup only for library publishing or legacy projects

For existing projects:

• Webpack → Vite: Significant DX improvement, same bundle quality
• Webpack → Turbopack: Only if Next.js migration makes sense
• Rollup → esbuild: 5-10x build speed gain, slightly larger bundles
• Benchmark your specific codebase before committing

Reproducibility

All benchmark code and configurations available at: https://github.com/staticblock/typescript-bundler-benchmarks-2025

Running the Benchmarks

# Clone repository
git clone https://github.com/staticblock/typescript-bundler-benchmarks-2025
cd typescript-bundler-benchmarks-2025

# Install dependencies
npm install

# Run full benchmark suite
npm run benchmark

# Run specific bundler
npm run benchmark:esbuild
npm run benchmark:vite
npm run benchmark:turbopack
npm run benchmark:rollup

# View results
npm run results:visualize

Test Project Configurations

// esbuild.config.js
require('esbuild').build({
  entryPoints: ['src/index.tsx'],
  bundle: true,
  minify: true,
  sourcemap: true,
  target: 'es2020',
  outdir: 'dist',
  splitting: true,
  format: 'esm',
  loader: { '.ts': 'ts', '.tsx': 'tsx' }
}).catch(() => process.exit(1));

// vite.config.ts
import { defineConfig } from 'vite';
import react from '@vitejs/plugin-react';

export default defineConfig({
  plugins: [react()],
  build: {
    target: 'es2020',
    minify: 'esbuild',
    sourcemap: true,
    rollupOptions: {
      output: {
        manualChunks: {
          vendor: ['react', 'react-dom', 'react-router-dom']
        }
      }
    }
  }
});

// next.config.js (Turbopack)
module.exports = {
  experimental: {
    turbo: {
      rules: {
        '*.svg': {
          loaders: ['@svgr/webpack'],
          as: '*.js',
        },
      },
    },
  },
};

// rollup.config.js
import typescript from '@rollup/plugin-typescript';
import resolve from '@rollup/plugin-node-resolve';
import commonjs from '@rollup/plugin-commonjs';
import terser from '@rollup/plugin-terser';

export default {
  input: 'src/index.tsx',
  output: {
    dir: 'dist',
    format: 'esm',
    sourcemap: true,
  },
  plugins: [
    resolve(),
    commonjs(),
    typescript(),
    terser()
  ]
};

Last Updated: October 31, 2025 Tool Versions Tested: esbuild 0.24.0, Vite 6.0.1, Turbopack (Next.js 15.1.0), Rollup 4.27.3