Ditto Stopwatch, it is way better.
Regarding performance measuring you should also check whether your "// Some Execution Process" is a very short process.
Also bear in mind that the first run of your "// Some Execution Process" might be way slower than subsequent runs.
I typically test a method by running it 1000 times or 1000000 times in a loop and I get much more accurate data than running it once.
