Stumble upon this thread from google
With the recent changes that they have added to GDScript, I think it has evolved into a very productive programming language to work with. However I think the issue with GDScript is that it’s not performant at all, everything has to go to the looks up, before it go through the actual things, meanwhile in C++ you just go straight to the memory address. Optimizing a language like GDScript is potentially very difficult due to heavily String-based, ie signal connections, Object’s set() and get() methods, among other things.