There are two issues with the screen. The first is that 4 rows of pixels are cut off at both the top and bottom, and unfortunately there’s not much I can do about that. Resizing the image would cause too much distortion.
The second issue is the fill patterns, and that’s something I can experiment with and hopefully improve.
As for performance, that’s exactly why I’m asking people to tell me which games they play. I’ll use those games to test and optimize the emulator as much as I can.
Thanks a lot for the feedback!