fastest c/c++ compilers

In your opinion, how would you compare the speed of the programs produced by the MSVC, GCC and ICC C/C++ compilers?

With time?
yes, if you were to take an identical program....a large program, say a 3D game, and run that same code in all three compilers, which would run faster? I know programmers have different criteria for what is fast for them and have different benchmarking techniques for measuring that speed, thats why I asked "in your opinion" in the first post, because no one can agree exactly on how to measure speed.