In a built .Net application, which executes faster? VB or C#?

Historically, C++ or any variant thereof, would run circles around a VB application. It would seem to me that this might still hold true. Both depend on Framework, so I don't know...

The reason I ask is that I have a heavy number-crunching application I wrote in VB2008. If it would help, I would recode it in C#. However, I am just starting to learn C#, so it would be sort of hard to do. The other side of that coin is what I would learn in the process.