Hi! Currently we're having some issues with dynamically loading parts of the map, for example. We're working on some optimizations, but we know that a lot of these problems are being solved in Godot 4, so if you can wait for its release you'll have less things to worry! 😅
We don't know if we'll end up making the switch to the new version, as it would break a lot of stuff, but we think we can work around most of these issues.
(Important thing to note is I'm not the programmer, so I can't give you many details hahah You can join our Discord and talk to him if you want, though!)