npm vs Yarn vs pnpm in CI: Speed, Disk & Reliability

In CI, your package manager choice affects install time, disk, and cache hit rate more than anywhere else.

All three install Node dependencies, but they differ on speed, disk usage, and how well they cache in CI.

	npm	Yarn	pnpm
CI install command	npm ci	yarn --frozen-lockfile	pnpm i --frozen-lockfile
Disk usage	High	High	Low (content-addressed store)
Typical speed	Baseline	Fast	Fastest with warm store
Strict by default	Loose	Loose	Strict (no phantom deps)

For CI specifically

pnpm usually wins on speed and disk thanks to its content-addressed store, which matters on constrained runners. npm is the safest default with zero setup. Yarn (esp. Berry/PnP) is fast but adds config nuance.

Cache it either way

Whichever you pick, cache the store keyed on the lockfile - that is the bigger speedup than the tool choice.

The verdict

Want max CI speed and low disk: pnpm. Want zero-config safety: npm. On any of them, caching + faster runners matter more than the tool.

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