This has been my finding as well. I have a few PCs and on my two high end gaming PCs I can run Fore! 06 without choppy sound on medium graphics if I use the mame emulator mameuifx. (change sample rate to the lowest and audio latency to the highest) I tried running it on a dell optiplex 780 and no luck, even with groovyarcade. I upgraded the CPU in the optiplex and it can run fine on low but still not medium.