SDL Sound can be tricky under Linux and can slow down the emulation tremendously.
See the SDL website (FAQs) for how to set environment variables that might help.
Using WindowBlinds in WinXP will cause the program to come up in a tiny window.
Either fix this by minimizing and restoring the window or by setting kat5200 to
run in Windows 2000 compatibility mode.
When using the GameBase frontend with kat5200, make sure your roms do not have
dashes in the filename. (ex, "Pac-Man.bin")