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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?
The .NET code is compiled into native code by the JIT compiler, so you get native code in both cases.
The difference is that the C code has somewhat less overhead around the calculations, so you should perhaps expect a performace difference of factor 2.