If I used OpenGL in fltk-rs, would it take up more system resources?

I am considering using fltk-rs to design GUI applications but I have a question, if I used OpenGL inside fltk-rs, then would it take up more system resources?

More then what? Then OpenGL over raw system API, or then implementing the same UI on FLTK without OpenGL?

I am comparing if I used fltk-rs if I used opengl with fltk-rs (you can do that) then would it use more system resources than using fltk-rs alone?

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