Hey Tom I did some tests today and noticed it was still quite slow after the update even after exiting and going back in. I then deleted the cache files and ran it only took 23 seconds first time, then second time 14 seconds. I've noticed it's only cached EMU_41 to EMU_47 but I have 77 emu's enabled (albeit as testing only with no actual ROMs). If that is okay, it's a very big improvement, although it may have been an issue with the cache before as well.