I've got Intel dual core with Windows 7 and was having the slow motion issue. I've tried a myriad of things, but what was most effective for me was to reboot, go into the BIOS, and under Performance, I disabled SpeedStepp. Once I did that, the slow motion problem improved significantly. I could make it even better by setting the affinity, etc, but disabling SpeedStep is what made the big difference. It rarely occurs now. I've read that based on what BIOS you have, you may or may not have the ability to disable this.
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