You didn't list the rest of your hardware ... how many drives are involved, what types, that sort of thing.
I can't tell but if you went from say a spinning disc to a new faster SSD, you might simply be able to do enough more in/out of that drive such that you pushed a bottleneck elsewhere. Bill Gehrke is the expert for this sort of thing, he does answer some things here but is oft found over on the Hardware forum ...
I just built a new computer:
Windows 10 Pro
Intel Core i7-6700K CPU @ 4.00GHz
32 GB RAM
I just installed Premiere CC 2015.3 and when I do direct export as Windows Media HD 1080p 24 is goes insanely slow compared to my previous version (Premiere 5.5) on a slower computer.
CPU utilization hovers around 40-50%, Memory utilization hovers around 25%.
There is no difference if I use the media encoder.
What settings must be adjusted to correct this?
I actually posted the wrong information. I used to run on Windows 7 on SSD. Now I upgraded to Windows 10 on SSD.
I have 2 hard drive, 3TB each to hold the media.
I will move to hardware forum.