auditing-performance

What the source does

• FilesystemNone observedNo reads or writes in the source
• NetworkNone observedNo outbound calls in the source
• ShellNone observedNo commands run in the source
• DependenciesPinnedNothing floats
• SecretsNone foundNo keys in source

Five audit layers

Gates applied: no behavioural pass.

Audit 0.4.1 · source sha 94fd3401595c · 22 Oct 2026Report an issue or request a re-scan

• Publisherspencerpauly GitHub userOwner of the repository this skill is read from
• Source folderspencerpauly/awesome-cursor-skills/resources/auditing-performanceThe exact folder we audited
• LicenceCC0-1.0As the repository states it
• Commit pinned for this verdict94fd3401595cA new audit runs when the source changes
• Repository statusNot archivedLast push 81 days ago
• Sandboxed runNot runSkills are read, not executed; layer L4 is skipped

Its description: Audit and optimize application performance, including bundle size, rendering, database queries, and Core Web Vitals.

---
name: auditing-performance
description: Audit and optimize application performance, including bundle size, rendering, database queries, and Core Web Vitals.
---

# Performance Audit

Use this skill when the user asks to optimize performance, reduce load times, fix slow pages, or audit Core Web Vitals.

## Steps

1. **Analyze bundle size**
   - Run `npx @next/bundle-analyzer` (Next.js) or `npx vite-bundle-visualizer` (Vite) to identify large dependencies.
   - Look for large libraries that could be replaced with lighter alternatives (e.g. `moment` → `date-fns`, `lodash` → individual imports or native methods).
   - Check for duplicated dependencies in the bundle.
   - Verify tree-shaking is working (no barrel file re-exports pulling in unused code).

2. **Audit rendering performance**
   - Identify components that re-render unnecessarily — look for inline object/array/function creation in JSX props.
   - Check for expensive computations in render paths that should use `useMemo`.
   - Verify lists use proper `key` props (not array index for dynamic lists).
   - Look for layout thrashing (reading DOM measurements then writing styles in a loop).

3. **Check data fetching**
   - Identify request waterfalls — sequential API calls that could be parallelized with `Promise.all`.
   - Look for data fetched on the client that could be fetched on the server.
   - Check for missing pagination on large data sets.
   - Verify API responses aren't over-fetching (returning fields the client doesn't need).

4. **Database query optimization**
   - Look for N+1 query patterns (a query per item in a list).
   - Check for missing indexes on columns used in WHERE, ORDER BY, and JOIN clauses.
   - Identify queries that could use `SELECT` with specific columns instead of `SELECT *`.
   - Look for missing connection pooling.

5. **Check assets**
   - Verify images use modern formats (WebP/AVIF) and are properly sized.
   - Check for missing `loading="lazy"` on below-the-fold images.
   - Verify fonts use `font-display: swap` and are preloaded.
   - Check for render-blocking CSS or JavaScript.

6. **Generate recommendations** — produce a prioritized list of optimizations ranked by impact (High / Medium / Low) with estimated effort for each.

## Notes

- Focus on measurable improvements — use Lighthouse, WebPageTest, or the Performance tab in DevTools.
- Don't prematurely optimize — profile first, optimize bottlenecks.
- For React apps, use React DevTools Profiler to identify slow components.

Excerpt, first 2,513 characters of SKILL.md, verbatim from the audited commit. It is text from someone else’s repository, quoted so you can judge it before your agent reads it.

git clone https://github.com/spencerpauly/awesome-cursor-skills
git -C awesome-cursor-skills checkout 94fd3401595c

Works in

1. 2026-10-22
   ✓SAFE B 89 / 100

   first audit · source 94fd3401595c

Questions about auditing-performance

• github.com/spencerpauly/awesome-cursor-skills/tree/main/resource — the audited source at commit 94fd3401595c and every finding aboveObserved · 22 Oct 2026

Spotted something wrong? Report a correction · Methodology