Yeah, the DeSmUne/2015 cores run pretty awful on the Raspberry Pi boards, but the stand-alone DraStic emulator as part of the Retropie package runs damn near perfectly. It did on the basic Pi 3B and the 3B+, and the 4B is no exception. I figured I’d suggest it for an excellent core to add, and yes, I know it’s not quite as simple as integrating it into a library and calling it a day. I just wanted to plant the seed, is all. 
