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Re:Dwarf Fortress: An actual look at graphical improvements by hutzlibu on Thursday March 26, 2020 @03:32PM (#22697036)
"so things move a lot faster if you're not spending CPU on graphics."

Thats why most have a GPU and that is why there are graphic engines, who do the rendering only of what is needed and produced by the simulation. So no, unless DF uses the gpu for simulating which I doubt, better graphics will not really affect simulation speed, if done right.

But yes, that is much harder.

Re:Dwarf Fortress: An actual look at graphical improvements by bmn__ on Thursday March 26, 2020 @04:10PM (#22697414)
DF employs OpenGL for rendering, see file df_linux/g_src/renderer_opengl.hpp, so the GPU will be used if appropriate drivers are installed. "Text" tiles and graphics tiles are equally fast – they are always bitmaps under the hood, see df_linux/data/art/*.png.

There is also an ncurses renderer with plain Unicode text output for use in a terminal emulator which may be GPU accelerated, but most term software is not.