# Optimizing Webassembly Performance

> Audits WebAssembly performance and capability fallbacks.

- Skill: `socketdev/optimizing-webassembly-performance` (Agent Skill)
- Install (CLI): `npx skillmds@latest add socketdev/optimizing-webassembly-performance`
- Raw SKILL.md: https://api.skillmd.com/api/skills/socketdev/optimizing-webassembly-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-webassembly-performance

---


# Optimizing WebAssembly Performance

Start from a portable baseline module. A current Node/V8 capability is not a fleet support
guarantee: validate and instantiate the exact artifact on every supported host/version.

1. Read the shared [WebAssembly capability audit](../optimizing-performance/references/webassembly-capabilities.md).
2. Batch JS/Wasm work, pass bytes plus offsets, and separately measure compile, instantiate,
   load, crossing, execution, and retained-memory cost.
3. For shared memory, require an explicit maximum, correct atomics/thread toolchain, a
   synchronization design, and a non-threaded fallback.
4. Recreate typed-array views after memory growth and version cross-language layouts.
5. Keep late Wasm features behind a compile/instantiate probe and baseline variant.

For parser representation, use [optimizing-parser-performance](../optimizing-parser-performance/SKILL.md).