I will offer a slightly different view-
I have been getting consistently lower times running Linux:
the trick is that I have been running the winnt client under wine
I have done the benchmark wu with both the linux/wine setup and Win2K, at the same speeds and on the same machine, and gotten a slightly faster time consistently with Linux/wine.
I have not done the testing I would like to do yet, since that requires me losing quite a bit of crunching time (dual boot and run the same 10 wu with each os- then compare results/times), but I am convinced.
Both my Linux rigs use Wine, and I am trying to get it running on my diskless clients.
The difference is NOT earth shattering though, but I suspect that the difference will be more substantial on slower pcs, and those with smaller amounts of memory.