There's slowdown in the PS2 version? Strange... Its a common thing on PCs but on a console?
Well I never had problems with the PC version. I like the way u have to use your mouse to move the camera so no camera problems.
Oh maybe a little tip. Did u see that umm.. thing with an mdisk in the Akuda Bar that needs a code to be opened? (assuming the PS2 version has that too) Well u don't get that code in-game. U get it by completing a challenge in the dark room:
http://darkroom.ubi.com/
What does the mdisk contain? Well I guess ya gotta find that out for yourself.
But u don't need it to complete the game or anything.