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performance-pass

100 / 100 · Low risk

Fine to try.

By ham7a311/Vitrine (GitHub) · design · 11 stars · scanned at commit 3adb12a

Measure and fix how fast a site loads and responds on a mid-range phone - LCP, CLS, total blocking time, bytes by type, oversized images, font weight - with a Playwright script that throttles CPU and network, then fix the causes in order of impact and re-measure. Covers animated canvases and WebGL backgrounds, which must pause offscreen and fall back on weak devices. Use before launch, when a page feels slow on a phone, or after adding heavy visuals.

Works with any agent that supports SKILL.md skills.

What this skill can do

We found nothing in the files we read that matches our rules. That does not prove the skill is safe: see the limits of static scanning.

Install

Paste this into your terminal. It downloads exactly the version we scanned, not whatever is newest.

if [ -e ~/.agents/skills/'performance-pass' ] || [ -L ~/.agents/skills/'performance-pass' ]; then echo 'A skill folder named performance-pass already exists — not replacing it' >&2; false; else d=$(mktemp -d) && git clone --quiet --filter=blob:none --no-checkout 'https://github.com/ham7a311/Vitrine' "$d" && git -C "$d" checkout --quiet '3adb12a6173883561dc40213fa39ae9dc4d0ce20' -- 'src/workshop/skills/performance-pass' && mkdir -p ~/.agents/skills && cp -R "$d"/'src/workshop/skills/performance-pass' ~/.agents/skills/'performance-pass' && rm -rf "$d"; fi

Codex reads ~/.agents/skills directly. For Claude Code, Cursor, Copilot, Gemini CLI, Antigravity or OpenCode, also link it. For Claude Code: ln -s ~/.agents/skills/'performance-pass' ~/.claude/skills/'performance-pass' (other agents: ~/.cursor/skills, ~/.copilot/skills, ~/.gemini/skills, ~/.gemini/config/skills, ~/.config/opencode/skills). Or install through the finder skill, which does both.

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