Hmm. Have you played around with the Properties of the .exe itself? I know I had slow frame rate (nothing unplayable, felt like a steady 24 fps) until I fixed the DPI settings.
Right click > Properties > Compatibility > Change high DPI settings > Check both boxes for Program DPI and High DPI scaling override
Hope this helps. Give it a shot if you haven't!
flakyfish
D joined
One of the original testers for RGM on bithandler circa 2007.