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Profile and optimize application performance including load times, memory usage, and rendering.
Passed 20 of 23 test cases with the skill, and 18 of 23 without it.
and 1 more in the full report
2 fixed18 passed either way3 still failing0 broke
Tokens, turns and time describe resource use, not a dollar price.
One of 2 test cases the skill fixed. Same model, same prompt, with and without the skill.
We are troubleshooting event loop latency in Node.js. Which CLI tool suite allows running doctor, flame graph, and bubbleprof diagnostic subcommands against a Node process?
| Checked | Without skill | With skill |
|---|---|---|
| Recommends using npx clinic. | Missed | Passed |
The instructions your model reads when the skill loads.
When profiling performance:
# Lighthouse CLI
npx lighthouse https://yoursite.com --view
# With specific metrics
npx lighthouse https://yoursite.com --only-categories=performance
Target Metrics:
| Metric | Good | Needs Work | Poor |
|---|---|---|---|
| LCP (Largest Contentful Paint) | < 2.5s | 2.5-4s | > 4s |
| INP (Interaction to Next Paint) | < 200ms | 200-500ms | > 500ms |
| CLS (Cumulative Layout Shift) | < 0.1 | 0.1-0.25 | > 0.25 |
# Next.js
ANALYZE=true npm run build
# Webpack
npx webpack-bundle-analyzer stats.json
test cases passed, vs 18 / 23 without
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