I think its in the EULA that it has to be in there somewhere. In fact, somebody in a nearby thread is discussing that very topic, I believe. If I run across it, I'll drop a link in here.
https://forum.game-guru.com/thread/211120
https://forum.game-guru.com/thread/211023MAME Cab PC: i7 4770@3.4Ghz (passmark 9945), 12GB RAM, Win 8.1/64, GeForce GTX645 (passmark 1898); Shiny new laptop: i7 4800MQ@2.7Ghz (passmark 8586), 16GB RAM, Win 8.1/64, GeForce GTX870M (passmark 3598); Old laptop: i5@2.3Ghz, 8GB RAM, Win 7/64, Intel 3000 graphics