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Use when auditing slow page loads, heavy assets, or rendering delays related to Use resource hints for faster loading. Verify the actual bottleneck in DevTools, Lighthouse, or field data before recommending changes.
Passed 22 of 22 test cases with the skill, and 21 of 22 without it.
1 fixed21 passed either way0 still failing0 broke
Tokens, turns and time describe resource use, not a dollar price.
A test case the skill fixed. Same model, same prompt, with and without the skill.
Please review my website's asset loading strategy. I want you to analyze my network requests and routing setup to see if I am missing opportunities to fetch critical assets earlier. Output a code review report that identifies specific files or rendering steps that create unnecessary network overhead, and be sure to detail how I should measure the issue to verify it.
| Checked | Without skill | With skill |
|---|---|---|
| Explains the purpose of preload | Passed | Passed |
| Explains the purpose of prefetch | Passed | Passed |
| Explains the purpose of preconnect | Missed | Passed |
| Explains the purpose of dns-prefetch | Missed | Passed |
The instructions your model reads when the skill loads.
Resource hints let the browser start fetching critical assets earlier—improving LCP by 100-300ms on average.
Analyze resource hints on this page and verify critical resources use preload/preconnect for optimal loading.
Add appropriate resource hints (preload, prefetch, preconnect) for critical assets to improve loading performance.
Explain the differences between preload, prefetch, preconnect, and dns-prefetch and when to use each.
Review the routes, assets, and loading behavior that affect Use resource hints for faster loading. Flag exact files, requests, or rendering steps that add unnecessary network, CPU, or layout cost, and describe the measurement method used to confirm the issue.
For full implementation details, code examples, and framework-specific guidance,
see references/rule.md.
Rule page: https://frontendchecklist.io/en/rules/performance/performance-resource-hints
test cases passed, vs 21 / 22 without
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