Performance Optimization Audit

Audit {{file_or_component_path}} for performance issues.

Context: This is a {{component_type}} that {{what_it_does}}. Users report it feels {{performance_complaint}}.

Check for:

**React-specific** (if applicable):
- Unnecessary re-renders: missing memo, useMemo, useCallback
- State updates that could be batched
- Components that should be lazy-loaded
- Large lists missing virtualization

**Data fetching**:
- Waterfall requests that could be parallel
- Missing caching / stale-while-revalidate
- Over-fetching (fetching more data than displayed)
- N+1 query patterns

**Bundle**:
- Large imports that could be tree-shaken or dynamically imported
- Dependencies with smaller alternatives

**Runtime**:
- Expensive computations on every render
- DOM measurements forcing layout thrashing
- Animation jank (layout properties instead of transform/opacity)

For each issue:
- Impact: High / Medium / Low
- Current code snippet
- Optimized code snippet
- Estimated improvement (be specific: "reduces re-renders from N to 1" or "cuts bundle by ~40KB")

Prioritize by impact. Don't suggest micro-optimizations that save less than 1ms.