#benchmarking

Bunintermediate

Benchmarking Bun's cold start against Node with performance.now()

const measureColdStart = (cmd: string[]) => {
  const start = performance.now();
  Bun.spawnSync(cmd);
  return performance.now() - start;
};

Bun.spawnSync plus performance.now() around each call turns a cold-start comparison against Node into a five-line, dependency-free benchmark.

Node.jsintermediate

performance.now() / hrtime.bigint() for accurate micro-benchmarks

import { performance } from "node:perf_hooks";

const benchmark = (fn: () => void, iterations = 100_000) => {
  const start = process.hrtime.bigint();
  for (let i = 0; i < iterations; i++) fn();

process.hrtime.bigint() gives nanosecond integer precision for micro-benchmarks; performance.now() is ms-resolution and good enough for most cases.