Try putting GLFW's source code into one file and then compile it. That will take at least a few seconds, RGFW compiles in less than a second.

Where's the bloat? :)

https://github.com/SasLuca/glfw-single-header/blob/master/ex...

The issue if if you have many such libraries and any change to the implementation forces recompilation of everything. Maybe not such a big deal for such small libraries, but an annoying trend IMHO.