How fast is VB .net compared to native code for arithmetic?

Question

I need to write software that will do a lot of math. Mostly it will be matrix multiplication with integers to compute DCT. How much faster should I expect the code to run in native c as compared to VB .Net? Factor of 2, factor of 10, factor of 1000...? Has someone tried and collected statistics on this?

Answer 1

.Net code is JIT-compiled to native code before execution, so it should not be slower than native code in general. I'd expect a factor < 10.

Moreover, adaptive optimization techniques profile the code as it runs, gaining more information than a typical static compiler. So, the JIT can make more informed decisions for further optimizations