I agree the debugger will likely run the code more slowly, but that means that the values from gettimeofday() should be more widely spaced, not grouped together the way they are.
Examine what is said, not who speaks.
"Efficiency is intelligent laziness." -David Dunham
"Think for yourself!" - Abigail
"Memory, processor, disk in that order on the hardware side. Algorithm, algoritm, algorithm on the code side." - tachyon