import { monitorEventLoopDelay } from 'node:perf_hooks';
import { setTimeout as delay } from 'node:timers/promises';
const histogram = monitorEventLoopDelay({ resolution: 20 });
histogram.enable();
await Promise.all(Array.from({length: 20}, async (_,i) => { await delay(20 + i); return i; }));
histogram.disable();
console.log({
  minMs: Number(histogram.min / 1e6).toFixed(2),
  maxMs: Number(histogram.max / 1e6).toFixed(2),
  meanMs: Number(histogram.mean / 1e6).toFixed(2),
});