JavaScript Study Portal

TL;DR

1. Minimize DOM Access - Cache DOM references
2. Batch DOM Changes - Use fragments, cssText, classes
3. Debounce/Throttle Events - For scroll, resize, input
4. Use Event Delegation - One listener instead of many
5. Lazy Load Resources - Load only what's needed
6. Cache Results - Memoize expensive computations
7. Optimize Loops - Cache length, use appropriate methods
8. Parallel Async Operations - Use Promise.all()
9. Avoid Memory Leaks - Remove listeners, clear timers
10. Measure Performance - Use Performance API to identify bottlenecks