Thanks for checking. I do have a couple of suspicions, and oddly, I don't think it's the bullets. I've done stress tests and my machine is less performant than yours.
There is an existing issue with the AI that makes things chug (especially on dev builds), but they're requiring a rework already. I'll be looking into it as a super high priority task.
I don't know if you experienced it, but it also appears that my precaching system is not good enough for Godot and sometimes you can still get some nasty stutters the first few times.
But I'll give this a good check and profile it over the next while. Sorry for the experience ._. I'll hopefully have it fixed next DD