It may not be a driver issue and thus nothing can be fixed with updates. During SH4 the devs admitted they didn't like the lack of cooperation the (then pre amd) ati support provided and so ATI coding issues didn't get resolved. This attitude may have continued.
Amazing enough, graphics drivers aren't the only thing impacting frame rates. Any of your other drivers (including sound) can impact the CPU and thus graphics and everything else.
If your puter meets or exceeds the optimum specs and the game specifically supports your card, you should take a look at the full range of typical culprits:
1) bios version.
2) miniport (nic, etc.)
3) sound.
4) controllers (keyboard, hotkeys, joystick, profilers) which may be sending spurious signals or supporting software buggy.
5) malware. The one program you cannot live without is probably the one killing you.
6) Protection software. Sometimes the "good guys" are worse than the "bad guys."
7) too many apps and/or background programs.
8) graphics settings set unrealistically high for your machine's performance (wishful thinking syndrome.)
9) memory (too slow or too little available causing too much disk cache usage. Disk cache size too small or set to dynamic causing too much resizing.
10) screen resolution and or refresh rate incompatibility.
11) partially failed hardware components (HDs typically.)
12) ATI Catalyst updates often work better when a full un-install has been performed first.
13) Tried setting the ATI control panel to defaults and checked results?
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