Oops, I forgot that I replied to this thread recently. Here's the next value down to test in the maximum memory box: 2048. Windows should be fine with that. If Beyond Divinity is still slow at high resolutions after that, then I've run out of ideas. Beyond Divinity's FPS shot right back up to normal for me when I entered 3072, but I only have 512 MB of video memory, as mentioned.
