how useable is OS 4 on an emulator though? Meaning, how slow is it?
About as fast as OS3.x was on PPC UAE before we had a JIT version, so it's usable. If someone writes a PPC uaegfx driver for p96 and a bsdsocket,library it'll be a lot more usable but Toni only does 68k stuff so it's up to someone else to do it.