Why does C# execute Math.Sqrt() more slowly than VB.NET?

Question

Background

While running benchmark tests this morning, my colleagues and I discovered some strange things concerning performance of C# code vs. VB.NET code.

Answer 1

Off on a tangent, if you're up and running with VS2010, you can take advantage of PLINQ and make C# (probably VB.Net as well) faster.

Change that for loop to...

var range = Enumerable.Range(2, 5000000);

range.AsParallel()
    .ForAll(i => testIfPrimeSerial(i));

I went from 7.4 -> 4.6 seconds on my machine. Moving it to release mode shaves a little more time on top of that.