Cold and Warm Install Times

Five rounds give a median and show the spread.

Running the benchmark five timesShell

cd ~/v5-ch1 && RUNS=5 ./bench.sh

Output

run 1  npm  cold 6.54s  warm 0.95s
run 1  pnpm  cold 2.52s  warm 0.26s
run 1  bun  cold 1.73s  warm 0.08s
run 1  yarn-pnp  cold 4.43s  warm 0.52s
run 1  yarn-nm  cold 5.17s  warm 0.92s
...

Install times for BookNest's dependencies, five runs each
Tool	Cold median	Cold range	Warm median	Warm range
npm 11.19.0 2,036	6.12 s	5.94-6.54 s	0.94 s	0.89-1.80 s
pnpm 12.6.0 69,400	2.58 s	2.52-3.02 s	0.22 s	0.22-0.26 s
Bun 1.4.2 73,307	1.88 s	1.73-2.16 s	0.08 s	0.07-0.13 s
Yarn 4.18.1 11,798 , PnP	5.31 s	3.88-6.56 s	0.57 s	0.50-1.35 s
Yarn 4.18.1, node-modules	5.21 s	4.97-6.07 s	0.82 s	0.82-0.92 s

Median install times for BookNest's dependencies (five runs, shared 4-CPU machine)

Cold, Bun was about 3.3 times faster than npm and pnpm about 2.4 times; both Yarn modes landed near npm, and PnP's wide spread (3.9 to 6.6 s) shows network latency dominating. Warm, Bun took 0.08 s, about 12 times faster than npm, and pnpm 0.22 s: both link files from a cache instead of extracting archives. npm's single 1.80 s warm run is the kind of outlier a busy neighbor on a shared machine causes, which is why medians matter.

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