The only other thing I would try on top of the Omega drivers, is this.
Go to your desktop, right click, and bring up the properties menu. Click on the settings tab then on the advanced button. You should see another window with a couple more tabs on it. On one of those tab sheets are options such as anti-aliasing and such; disable all of these. There will also be either a slider or check box to adjust quality verses performance. Set everything to performance.
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