Perf check

Skill huzaifa525/claude-code-optimizer/templates/.claude/skills/perf-check

Optimize Claude Code token usage — 22 skills, 8 hooks, 6 rules. One npm install. Zero manual steps. Cut costs by 67%.

Install

npx -y skills add huzaifa525/claude-code-optimizer --skill perf-check

Assembled from the repository path, not quoted from the project. Check it against their README if it does not work.

One thing to look at

9 stars9 stars. Stars are a popularity signal and not a quality one, but at this level it is likely that nobody has read this closely except its author, and you would be relying on your own review.

What its author says it does

Copied from the file, not written here

Use when the user wants to check performance, find slow code, identify bottlenecks, or audit efficiency.

SKILL.md

1.8 KB, as published. Nobody here has run it

Analyze $ARGUMENTS for performance issues.

Check Categories

Database & Queries

N+1 query patterns (loop with query inside)
Missing indexes on frequently queried columns
SELECT * instead of specific columns
Missing pagination on list endpoints
Unoptimized joins or subqueries

Memory & Resources

Unclosed connections, streams, file handles
Growing arrays/maps without limits
Event listeners not removed on cleanup
Large objects held in memory unnecessarily
Missing cleanup in useEffect (React)

Frontend Performance

Unnecessary re-renders (missing useMemo, useCallback, React.memo)
Large bundle imports (import entire library vs specific module)
Images without lazy loading or optimization
Missing code splitting
Synchronous operations blocking UI thread
Missing virtualization for long lists

API & Network

Missing caching (Redis, in-memory, HTTP cache headers)
Redundant API calls
Missing request deduplication
Large payloads without compression
Missing connection pooling

General

O(n²) or worse algorithms where O(n) is possible
Synchronous file I/O in async context
Regex backtracking (catastrophic regex)
Unnecessary deep cloning

Output Format

## Performance Report: [target]

### Critical (fix now)
- [file:line] [issue] [impact] [fix]

### Warning (should fix)
- [file:line] [issue] [impact] [fix]

### Suggestion (optimization)
- [file:line] [issue] [impact] [fix]

### Good Patterns Found
- [what's already well-optimized]