What I have:
-I have a brand new MacPro Trash Can, completely maxed out everything.
64GB ram | 2.7GHz 12 core Xeon E5 | OSX 10.9.3.
-You should know I have a new MacBookPro as well, and i am not experiencing this issue on that laptop.
My Problem:
-Rendering out of Premiere CC is taking for ever just as everyone has said.
-I changed the File>Project Settings>General Tab>Renderer - to software only, however that sped nothing up.
-1 Pass encodes also sped nothing up.
-I am linking project files with After Effects, but I do not think that is the issue.
My Solution:
For now I am jumping to Adobe Media encoder to make my MP4's, this looks like it is working faster, and is gives me a better view of where the file is in the rendering process.
* Adobe needs to get on this issue right now, if they have not already figured it out.
It is an extremely serious professional workflow issue.*