Looks great. What are you using for development?
It's hard to find answers on this because it's an ignorant question. The question doesn't have an answer, because you're asking the wrong questions. Godot 4 doesn't have inherit performance issues. There are performance characteristics in the way that you approach a problem, just like with anything else. Inexperienced devs are always concerned about performance _before_ they dive into problem solving, but the answer is always to work through performance _after_ you solve the problem.