08-13-2014, 07:54 PM
They did put a lot of work into MSVC's optimiser in the last couple of cycles. Also how much newer if the cpu in the faster computer? A lot of the recent processors have got more performance per cycle. Also your moving around a lot of strings in the code so you may be benefiting form move constructors. People have seen 5-10% gains on some code purely from turning on the c++11 standard libs.