Agent Skills › plugin87/ux-ui-agent-skills › performance

performance

GitHub

针对 Core Web Vitals (LCP/INP/CLS) 优化 UI 性能，涵盖加载策略、布局偏移预防及动画规则，确保低配设备流畅体验。

.claude/skills/performance/SKILL.md plugin87/ux-ui-agent-skills

Trigger Scenarios

提升网页速度修复界面卡顿或布局偏移优化移动端低端设备性能

Install

npx skills add plugin87/ux-ui-agent-skills --skill performance -g -y

More Options

Non-standard path

npx skills add https://github.com/plugin87/ux-ui-agent-skills/tree/main/.claude/skills/performance -g -y

Use without installing

npx skills use plugin87/ux-ui-agent-skills@performance

指定 Agent (Claude Code)

npx skills add plugin87/ux-ui-agent-skills --skill performance -a claude-code -g -y

安装 repo 全部 skill

npx skills add plugin87/ux-ui-agent-skills --all -g -y

预览 repo 内 skill

npx skills add plugin87/ux-ui-agent-skills --list

SKILL.md

Frontmatter

{
    "name": "performance",
    "description": "Optimize UI performance against Core Web Vitals — LCP, INP, CLS — with loading\/code-split strategy, layout-shift prevention, and animation performance rules. Use when the user wants to improve speed, fix jank or layout shift, hit Web Vitals budgets, or make a UI feel fast on low-end devices."
}

Skill: Performance

Step 0 — is the kit here? This skill reads files from the kit. Check once: ls ${CLAUDE_SKILL_DIR}/../../../tokens >/dev/null 2>&1 && echo KIT_OK || echo KIT_MISSING On KIT_MISSING only the skill folders were installed, which is what npx skills add does. Say so plainly, point the user at npx ux-ui-agent-skills init or the plugin install, and stop. Do not guess the contents of a file you could not open.

Make the UI fast and stable. Treat performance as an accessibility concern — slow/janky UIs fail low-end devices first.

Steps

Read ${CLAUDE_SKILL_DIR}/../../../workflows/performance.md (Core Web Vitals targets, loading strategy, layout-shift, animation perf, design-system runtime cost).
Diagnose against budgets: LCP ≤ 2.5s, INP ≤ 200ms, CLS ≤ 0.1. Measure on a mid-tier mobile profile (throttle slow 4G + 4× CPU).
Loading: render above-fold first (SSR/Server Components), code-split by route + heavy widget, lazy-load below-fold/behind-interaction (Astro islands / Qwik), preload one critical font weight, modern responsive images.
Kill layout shift: size skeletons to final dimensions, reserve media space via aspect-ratio (${CLAUDE_SKILL_DIR}/../../../tokens/sizing.json), never inject content above existing.
Animation: only transform/opacity, will-change sparingly, 100–300ms (${CLAUDE_SKILL_DIR}/../../../tokens/motion.json), honor prefers-reduced-motion. Prefer CSS state styling over JS for low INP; tree-shake/per-component imports.

Verification (definition of done)

Lighthouse / field data meets LCP ≤ 2.5s, INP ≤ 200ms, CLS ≤ 0.1 on mid-tier mobile.
First interaction stays responsive under slow-4G + 4× CPU throttle.
Skeletons + media reserve space (zero CLS on load); no non-compositor animation in loops.