Webpack 5.90 vs. Turbopack 0.6: Building Next.js 16 Apps with 100k Lines of Code The Next.js ecosystem has long relied on Webpack as its default bundler, but Vercel’s Turbopack has emerged as a Rust-based challenger promising faster builds and better performance. With Next.js 16 now stable, we pitted Webpack 5.90 against Turbopack 0.6 using a 100,000-line production-grade codebase to see which bundler comes out on top. Test Setup To ensure a fair comparison, we used an identical Next.js 16.0.0 project configured with: 100,000 lines of TypeScript/React code across 1,200 components, 80 API routes, and 40 pages Matching dependencies: React 19, Tailwind CSS 4, Prisma 6, and SWR 3 Equivalent build configurations: both bundlers used default Next.js 16 settings with no custom optimizations Test environment: 16-core AMD Ryzen 9 7950X, 64GB DDR5 RAM, NVMe SSD, Node.js 22 LTS Build Performance Initial Production Build Webpack 5.90 completed a full production build in 142 seconds, while Turbopack 0.6 finished in 47…