The body is reasonably lean (~30 lines) but opens with a context stat ('Studies show 53% of mobile users abandon sites...') that explains impact Claude already knows, and the Quick Reference section restates the threshold facts. Not a 3 because these passages do not each earn their place against the lean/efficient anchor; not a 1 because there is no padding explaining basic concepts at length.

The Fix section names techniques ('lazy loading, CDN usage, caching strategies, and resource optimization') and the Check section says to 'Measure the page load time', but neither gives concrete commands or specifics, and the body omits the DevTools/Lighthouse/field-data method named in the description. The Code Review section is more concrete ('Flag exact files, requests... describe the measurement method'). Not a 3 because guidance is incomplete and missing key measurement details; not a 1 because it does name concrete optimization techniques rather than being purely abstract.

A sequence is present (Check → Fix → Explain → Code Review) but there are no validation checkpoints or feedback loops, and 'verify it's under 3 seconds' has no explicit pass/fail handling. Not a 1 because steps are clearly listed in order; not a 3 because validation gaps and implicit checkpoints remain. The skill is not a batch/destructive operation, so the feedback-loop cap is not the binding constraint here.

The body is a short overview (<50 lines) with a clearly signaled one-level-deep pointer to 'references/rule.md', which exists as a real file, plus the source rule URL. Not a 2 because the reference is explicitly signaled and not nested; the well-organized section structure qualifies for the simple-skill allowance.

The description lists multiple concrete actions ('auditing slow page loads, heavy assets, or rendering delays' and 'Verify the actual bottleneck in DevTools, Lighthouse, or field data'), matching the anchor for several specific concrete actions. Not a 2 because the named actions go beyond a single domain mention to a comprehensive audit/verify/recommend set.

It answers both 'what' (auditing/verifying page-load bottlenecks) and 'when' via the explicit 'Use when auditing slow page loads...' trigger clause, satisfying the both-what-and-when anchor. Not a 2 because the 'Use when...' trigger is explicit rather than implied.

It includes natural phrases users would actually say ('slow page loads', 'heavy assets', 'rendering delays') alongside tool names (DevTools, Lighthouse), giving good coverage of the domain's common vocabulary. Not a 2 because it spans several natural variations rather than a single keyword.

It targets a clear performance niche (page-load timing and Core Web Vitals territory) with distinct triggers unlikely to fire for unrelated skills. Not a 2 because the scope is narrowly scoped to load-time auditing rather than broadly overlapping with general performance skills.