Download an earlier catalyst, although I have Cat 10 and it runs like a dream, but then I have two cards so meh. You could try the graphics.cfg thread, I think it's linked in the FAQ, maybe there you could find a graphics cgf. Just make sure the first line is set to 1 to enable the file. Try this one here, it is what I currently use and works for me.
GP4 StuffYou should be getting the game to run well in standard un-modded condition. When you have that running as best as you can get it, then apply mods. That way you will know if it is the mod that is causing the slow-down, and not the game. Some mods are notorious for hogging the system and causing slow downs. Also, close any unnecessary programs, like virus scanners that seem to be always busy and doing whatever it is they do in the background.
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www.mediafire.com] Some say you should click it, you know you want to.
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www.gp4central.com] <----GP4 Central