^ Actually there is no difference between ISO and CSO from my experience.
If you have a fake stick from any brand, both formats will lag, if you have a real stick from decent brands, neither will lag.
Also some games naturally lag, even people with official game UMD and official firmware in both Phat/Slim experience frame drops. (Like certain songs in DJMAX Portable 1/2)
I've tested the whole CSO/ISO thing on multiple brands of sticks. God of War is my favorite example. It lags like a bitch when you run it from a CSO, regardless of what compression level was used or what card you were using. It lagged on both my store-bought Sandisk 2GB and on both of my Lexar 4GB's. The lags went away when I used my ISO copy.
CSO's are fine for many games, but there are some that suffer.
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QUOTE(drtofu @ Apr 12 2008, 10:26 PM) First Thanks for all your help. I ran the black speed thing and apparently my stick is amazing with a score of 864.... but for FF7 CC i lag like a mofo in videos i guess it doesn't matter but seeing how that game is fight movie fight movie etc... it gets rather annoying. and my gta vice city stories is a cso so that may be the issue in a bit I'll format to fat 16 i just kinda didn't want to because I would lose so much space..
Well off to format my stick ... and I'll report on my findings. oh yeah apparently mine is a magic gate so its not a crappy china one.
DrTofu
EDIT formating to fat works, thanks for the help. And i was dumb about the losing space thing i dunno what i was thinking then.