Summary
This one walks you through hitting Core Web Vitals targets (LCP under 2.5s, INP under 200ms, CLS under 0.1) on throttled mobile devices. It pushes server rendering or islands architecture for above-the-fold content, code splitting by route, and lazy loading everything else. The layout shift rules are practical: reserve space with aspect-ratio, size skeletons to match final content, never inject above existing elements. Animation discipline is strict, compositor-only properties with reduced motion support. The verification step actually throttles to slow 4G and 4× CPU, which will catch problems your MacBook won't. Treat this as accessibility work, because jank hits low-end devices hardest and performance budgets are really user-exclusion budgets.
Install to Claude Code
npx -y skills add plugin87/ux-ui-agent-skills --skill performance --agent claude-codeInstalls into .claude/skills of the current project.
Agent, run crypto. Access onchain data & trade routes via 1inch.
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On Capafy, your Skill runs online 24/7 as an agent product, and you get paid every time someone uses it.
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An agent that runs the SEO playbooks that move rankings and ships PRs you control.
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Connect Claude to +800M contacts, +150M companies. Find & Enrich leads in chat.
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Agent, run crypto. Access onchain data & trade routes via 1inch.
Install now →On Capafy, your Skill runs online 24/7 as an agent product, and you get paid every time someone uses it.
Start earning →An agent that runs the SEO playbooks that move rankings and ships PRs you control.
Get founding access →Connect Claude to +800M contacts, +150M companies. Find & Enrich leads in chat.
Try For Free →First SeenJun 11, 2026
