I really want Sonic CD to run smooth in Picodrive for PSP please help

I downloaded picodrive (which plays SEGA cd games) to my psp yesterday to play Sonic CD on there because I wanted to see if it could run,but no matter how many settings I tweak it runs ok but not butter smooth perfect! I don’t know how to fix that I have the PSP1000 model someone please help me out if they know what setting to change and I have 1.92 of picodrive I don't know if that is a problem