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Only two immediate suggestions but ones you should try before we troubleshoot further:
1) Load the latest ATI Catalyst drivers. Go to their website and be sure you have the most recent versions.
2) Turn on vertical sync. There should be an option under the ATI control panel to either force this always on or make it application controlled. If you do the later, then you should issue a Vizard viz.vsync(viz.ON) command in your script. Once done, your frame-rate (you can just press F4 at anytime) should read exactly your monitor refresh (presumably 60 Hz).
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