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E-UAE was based on SDL 1.x, which has software rendering in addition to OpenGL support. SDL 2.x has a renderer system yes, but that's basically also implemented on top of OpenGL, so not at all the same as for SDL 1.x/E-UAE.
The choice of renderer will be runtime configurable, but right now you can change
fsemu_video_set_renderer(FSEMU_VIDEO_RENDERER_OPENGL);
to
fsemu_video_set_renderer(FSEMU_VIDEO_RENDERER_SDL);
in fsuae-main.c if you want to see if that helps with performance.
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