React Native Performance

Problem Statement

React Native performance issues often stem from unnecessary re-renders, unoptimized lists, and expensive computations on the JS thread. This codebase has performance-critical areas (shot mastery, player lists) with established optimization patterns.

Pattern: FlatList Optimization

keyExtractor - Stable Keys

// ✅ CORRECT: Stable function reference
const keyExtractor = useCallback((item: Session) => item.id, []);