I did some tests as directed with a stopwach and carefully noted the results. Then I lost my notes.
It doesn't matter, there was no difference to the execution time in warp mode, aside from a couple of seconds per minute. I didnt look at cpu load during these tests.
Perhaps my 2ghz cpu isnt 'slow' enough to show a difference with these tests.
Thanks for providing the sse2 exe to test with, it was interesting to do.