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perf: don't set process.title - #8453
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sheremet-va merged 1 commit intoAug 19, 2025
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AriPerkkio
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Aug 19, 2025
AriPerkkio
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This was nice feature but maybe not worth the perf hit. Users can still do this in setupFiles I guess.
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Minimal repros without Vitest: const startTime = performance.now();
process.title = "node (example)";
console.log(`${(performance.now() - startTime).toFixed(2)} ms`);
// 12-15ms, Apple M2 Air 16BGInside import { fork } from "node:child_process";
import { fileURLToPath } from "node:url";
const SET_NAME = process.env.SET_NAME;
const isMainThread = process.send === undefined;
if (isMainThread) {
const startTime = performance.now();
const subprocess = fork(fileURLToPath(import.meta.url));
subprocess.on("exit", () => console.log(`${(performance.now() - startTime).toFixed(2)} ms`));
} else {
if (SET_NAME) {
process.title = "node (example)";
}
}$ node ./example.mjs
26.50 ms
$ node ./example.mjs
27.05 ms
$ node ./example.mjs
26.66 ms
$ SET_NAME=1 node ./example.mjs
40.38 ms
$ SET_NAME=1 node ./example.mjs
39.52 ms
$ SET_NAME=1 node ./example.mjs
38.79 msUsing import { fork } from "node:child_process";
import { fileURLToPath } from "node:url";
const isMainThread = process.send === undefined;
if (isMainThread) {
const startTime = performance.now();
const subprocess = fork(fileURLToPath(import.meta.url), undefined, { execArgv: ["--title=node (example)"]});
subprocess.on("exit", () => console.log(`${(performance.now() - startTime).toFixed(2)} ms`));
} else {
// Child process running
} |
This was referenced Nov 3, 2025
This was referenced Nov 3, 2025
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Description
process.titletakes 10ms on my machine (MacBook Pro) and 20ms on @AriPerkkio's machine. We are considering removing this call to improve performance.Please don't delete this checklist! Before submitting the PR, please make sure you do the following:
pnpm-lock.yamlunless you introduce a new test example.Tests
pnpm test:ci.Documentation
pnpm run docscommand.Changesets
feat:,fix:,perf:,docs:, orchore:.