and used this one instead of the standard <command>.
Something must have worked; when i run mame now it’s apparently a different emulator, since it renders differently.
However, none of the roms that weren’t working before now do (which didn’t raise too much suspicion) BUT those that do (and did before) now run even more sloppy (@900 mhz) AND i can’t access the mame menu via tab.
So is this the recommended mame4all or even another one and i still need to do the manual way?
Im not 100% on this but it looks like you switched to the alternative MAME emulator. By default, retropie uses MAME4ALL. The es_systems contains the alternative emulator (usually an alternative because it doesn’t run as well for most people as the default set emu). Looks like you switched to the alternative emulator which would explain your performance decrease.