React JS: Best Practices, Pitfalls & Performance Tweaks for 2025

I’ve been working on a mid-size React project and started noticing performance lags and bloated component trees. I optimized a few things like:

Using useMemo() and useCallback() smartly (but not overusing)

Breaking components into smaller reusable ones

Lazy loading routes and components

But I’d love to know:

What are your go-to patterns for keeping React apps lean?

Are there any anti-patterns you see often in junior dev codebases?

Have you used React Server Components or Signals yet?

Share your tips, tools, or even code snippets. Let’s build a solid thread of modern React wisdom!