b66pak, interesting results. Even though you have an AMD processor, the ICL build (as used in current LameXP) still is significant faster than the MSVC build.
Also your results confirm that the "old" build was a bit faster in VBR mode (although the difference is bigger than on my system) and slower in CBR mode, compared to the "up-to-date" build.
However this doesn't explain what nik33134 is reporting. He claims that the "old" build was
faster in CBR mode. And he uses a very similar CPU