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claude-code

Claude-code-optimizer perf-check

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

install
source · Clone the upstream repo
git clone https://github.com/huzaifa525/claude-code-optimizer
Claude Code · Install into ~/.claude/skills/
T=$(mktemp -d) && git clone --depth=1 https://github.com/huzaifa525/claude-code-optimizer "$T" && mkdir -p ~/.claude/skills && cp -r "$T/templates/.claude/skills/perf-check" ~/.claude/skills/huzaifa525-claude-code-optimizer-perf-check && rm -rf "$T"
manifest: templates/.claude/skills/perf-check/SKILL.md
source content

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]
<!-- Skill by Huzefa Nalkheda Wala | github.com/huzaifa525 | claude-code-optimizer -->