Trying several combinations of optimization flags on the corei7-4 Ultrabook, I found performance sensitive to /Qunroll option. Setting /arch:core-avx2 /Qunroll2 frequently produces best performance with ifort 14.0.1. Without the unroll option, avx2 seldom improves over the Sandy Bridge avx option in my tests. This resolves several instances where gfortran was out-performing ifort, now that its avx2 option is becoming more reliable.
Windows 8.1 laptop performance repeatability depends also on opening up the Soluto configuration and taking their recommendations about removing optional applications from their startup menu. Even so, .dll loads have noticeable delay.