gdscript is dynamically typed. If you have the large arrays of structs common in gamedev, then all data members are boxed, significantly increasing memory usage compared to something like C#.
Apparently we have different definitions of boxing. To me, and I've always used it (and seen it used) like this, a boxed value is a value that's stored on the heap and passed as a pointer. Maybe C# has a different definition?
That’s correct, but not what you said. You said objects are boxed. Values are boxed to create a reference by wrapping it in an object, objects are already reference types so there’s no boxing.
I'm not extremely familiar with C# objects, but I think I get the confusion now. My point was that objects are boxed values, and that most things in C# are (to my knowledge) objects. I guess I used slightly the wrong words.