Finally, someone that understands what retroarch is... Unless you have a problem with its UI (which I like) or you can't get anything to run at all, the fault is with a particular CORE, don't just blanket blame retroarch... Sorry to be a retroarch apologist, I know it is a source of frustration here >_> I think retroarch is a great piece of software, and it is my go to, but that said....
@Denmdm you are right on some cores, and in my experience it is the sony cores... Beetle (psx) is usually pretty good, but there are some games where it chugs. And don't get me started on the pcsx2 (lrps2 now?) core, idk why but it is a dumpster fire (in my experience), and it looks like it got removed from the arch repository: when installing retroarch with garuda, it didn't even install that core

So they must know...
Yea, for ps2, standalone psx2 is the only way to go...