Cliff,
Based on the results that you provided Jim, the difference in fps will have to be CPU related. Your video card is not even working hard at all.
There must be a CPU operation that has changed from 1.1Wide to MD.
Since I don't have the original 1.1Wide source (Will has it), I can't be sure what else changed.
I am looking for other ways to speed it up that might help you though.
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