Structured performance optimization reference for React Native apps covering FPS, bundle size, TTI, and memory.

• Organized into 9 JavaScript/React guides (profiling, lists, animations, memory), 9 native optimization guides (Turbo Modules, threading, profiling), and 9 bundling guides (tree shaking, code splitting, size analysis)
• Each reference follows a hybrid format with quick patterns/commands, impact ratings (CRITICAL/HIGH/MEDIUM), and deep-dive explanations with prerequisites and common pitfalls
• Includes problem-to-skill mapping table for fast lookup: app jank points to FPS measurement, slow startup points to TTI measurement, large bundles point to analysis tools
• Measurement-first workflow: baseline metrics before optimization, re-measure after applying fixes, validate improvement (e.g., FPS 45→60, TTI 3.2s→1.8s, bundle 2.1MB→1.6MB)