optimize

Performance optimizer

Analyze and suggest performance improvements for code, queries, or systems.

Purpose

Identify optimization opportunities:

• Runtime performance bottlenecks
• Memory usage issues
• Database query inefficiencies
• Bundle size problems
• Algorithm complexity

Instructions

Step 1: Scope identification

Determine optimization target:

• Function: Single function performance
• Module: Related functions/classes
• Query: Database query optimization
• Bundle: Frontend bundle analysis
• System: Architecture-level optimization

Step 2: Performance analysis

Runtime analysis

# Find potentially slow patterns
grep -rn "forEach\|\.map\|\.filter\|\.reduce" --include="*.{ts,js}" . | head -20

# Find nested loops (O(n²) potential)
grep -rn "for.*for\|\.forEach.*\.forEach\|\.map.*\.map" --include="*.{ts,js}" . | head -10

# Find sync operations that could be async
grep -rn "readFileSync\|writeFileSync\|execSync" --include="*.{ts,js}" . | head -10

Memory analysis

# Large array operations
grep -rn "new Array\|Array\.from\|\.concat\|spread" --include="*.{ts,js}" . | head -10

# Potential memory leaks (event listeners, intervals)
grep -rn "addEventListener\|setInterval\|setTimeout" --include="*.{ts,js}" . | head -10

Database query analysis

# N+1 query patterns
grep -rn "await.*find\|await.*query" --include="*.{ts,js}" . | head -15

# Missing indexes hints
grep -rn "WHERE\|ORDER BY\|GROUP BY" --include="*.{ts,js,sql}" . | head -15

Bundle analysis

# Check bundle size (if applicable)
[ -f "package.json" ] && npm run build 2>/dev/null && ls -lh dist/*.js 2>/dev/null

# Large dependencies
[ -f "package.json" ] && cat package.json | jq '.dependencies | keys[]' | head -20

Step 3: Prioritization

Rank findings by:

1. Impact: How much will this improve performance?
2. Effort: How hard is the fix?
3. Risk: What could break?

Output format

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