The article updated to remove the cruft you noted. It dropped the 1M memory substantially Promise timers are now packaged by node at least, they allocate about

The article updated to remove the cruft you noted. It dropped the 1M memory substantially Promise timers are now packaged by node at least, they allocate about 20% less memory for the 1mil test (on v18). const { setTimeout } = require('node:timers/promises') https://nodejs.org/api/timers.html#timers-promises-api https://nodejs.org/api/timers.html#timers-promises-api