# Gate Performance

> Core Web Vitals quality gate for ultraweb builds — runs Lighthouse against the production build (≥90 performance on every route, mobile emulation is the score of record), audits the LCP element (next/image with preload — never the deprecated priority prop), proves zero CLS (intrinsic dimensions on all media), sweeps the client bundle ("use client" creep, single LazyMotion provider with m. components, no star imports of lucide-react), and verifies self-hosted next/font loading. Invoke in Phase 11 (Gates) of every ultraweb build, and whenever the user says "the site is slow", "Lighthouse", "Core Web Vitals", "LCP", "CLS", "bundle size", "page speed", or "performance audit".

## Facts
- Page: https://tashan.sh/capability/skill-blyatiful1-gate-performance
- tashan id: skill:blyatiful1/gate-performance
- Source: https://github.com/blyatiful1/ultraweb
- Type: skill
- Category: devtools
- tashan score: not scored (catalogued only — too little public evidence)
- Adoption: 9.0
- Upkeep: 99.0
- Freshness: 97.0
- Evidence coverage: 84% of the inputs this score can use
- Health: active
- Instruction depth: not yet graded
- License: MIT
- Official: no

## Install

```sh
cp -r gate-performance ~/.claude/skills/
```

## Security audit
Not scanned. We audit npm-published capabilities; this one has no npm package we can resolve, or has not reached the queue. This is not a clean bill of health.

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Measured 2026-08-23 by tashan (https://tashan.sh) from public evidence. Scorer s5.