I'm trying to isolate an issue.
On my setup, the GPU, HDD/SSD and memory has been upgraded to recommendation, but not the CPU (yes, I'm sure this is the answer, but I'll continue). I'm also using a Sega JVS I/O 837-13551.
Everything on my multi works with minimal slowdown except the "CPS-2" games, such as HSFII, VS, and SFA3, which all come to a crawl. The only games outright not working are SSFIV and Ultra Street Fighter, but SFIV is fine.
So is it the Celeron 3.2Ghz CPU? I do plan on changing this out soon, but I'm wondering if anyone else has seen issues with these games, possibly with this I/O, or possibly with a Samsung SSD.
Admittedly, my only apprehension so far is changing the CPU, because I've never done it before with a computer. Seems simple enough, though.