pnpm vs npm vs yarn in 2026: I ran all three on my real monorepo and it forced me to change my mind

The correct answer for speeding up installs in a monorepo is to make hoisting stricter . I know that sounds backwards. More strictness should mean more compatibility errors, more debugging time, more friction. And yet that's exactly what pushed me to adopt pnpm — after it first broke a Radix UI dependency at the worst possible moment.

That's the honest trade-off no synthetic benchmark shows you: pnpm is faster and leaner, but its strict hoisting model has teeth. When it bites, it hurts. And the official migration guide doesn't warn you when it's about to bite.

A few months ago I was deep in a sprint — Next.js 16 monorepo, strict TypeScript, Shadcn/ui, Radix UI, everything running on Railway. I switched from npm to pnpm following the usual benchmarks — you know the ones, they measure a react install with three dependencies on a clean machine.…