It really depends on how much actual logic you implement in Gdscript. It is really slow though, even slower than python as far as I know. So if you’re doing anything beyond gluing engine calls together (eg writing complicated enemy logic) its easy to run into performance issues. The “official” way to deal with that is to create gdextensions for the slow stuff, but at that point you might aswell do everything in C# (imo).

It’s easy to convince yrself that code is going to be fast enough, but games run into bottlenecks really quickly, and it also makes your stuff inaccessible to people who don’t have great hardware.