# Optimizing Javascript Performance

> Audits measured JavaScript and TypeScript performance.

- Skill: `socketdev/optimizing-javascript-performance` (Agent Skill)
- Install (CLI): `npx skillmds@latest add socketdev/optimizing-javascript-performance`
- Raw SKILL.md: https://api.skillmd.com/api/skills/socketdev/optimizing-javascript-performance/raw
- Safety review: pending
- Works with: Claude Code, Claude.ai, OpenAI Codex
- Category: Coding & Dev Tools
- Author: socketdev (https://skillmd.com/u/socketdev)
- Updated: 2026-09-17
- Page: https://skillmd.com/skills/socketdev/optimizing-javascript-performance

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# Optimizing JavaScript Performance

Profile the deployed Node/browser version after warmup. TypeScript types are erased, so
measure the emitted JavaScript, engine allocation/GC behavior, and host-boundary cost.

1. Read [JavaScript/TypeScript performance audit](../optimizing-performance/references/javascript-typescript.md).
2. Scan for per-item allocation, unstable record shapes, polymorphic call sites, callback or
   Promise churn, intermediate arrays/strings, regex/UTF work, and per-item native/Wasm calls.
3. Keep V8-friendly layouts as readable data design, not reliance on undocumented engine
   tiers or production-only flags.
4. Re-run corpus, Unicode/error, startup, heap, GC, and tail-latency measurements on every
   supported Node/V8 line affected.