These hitches (in unityland anyways) usually mean the dev is allocating a lot of short lived objects in their render loop. Even little heuristics like keeping the new keyword out of Update() and using object pools prevent the majority of things like this for us over on the unity side.

Dome Keeper's dev Bippinbits is a Godot studio. Some comments on their opinions that I can't read until I dig out my twitter login lol. https://x.com/Bippinbits/status/1702351798302851398

Godot has some perf warts still being churned out, so I don't know what all they've got to do to finesse around them. Even if GDScript was greasy gcc lightning, it's really easy to crunch yourself into some compromises when you're trying to eat your way out of the bottom of ticket mountain before Nextfest or you starve or whatever. Small team gamedev is wild.