Sorry about the delay,
I installed the HD Tune 2.55 on the machine without SEE installed. I tried to copy a 14GB data from D: drive to C: with the HD tune utility started.
What I found is it shows about 151 min to copy, if the stop the HD tune utility, it comes down to 20min.
I am not sure how this tool works, but it for sure cause performance to slow down.