I've been using a 2008 R2 install for a while, restoring 2008 R2 databases from a different install. 10GB DB took about 5 minutes at most to restore. I upgraded to 2012, and now the same backup takes hours to restore if it is even successful at all.
Thinking that something went funky with the upgrade, I wiped and installed 2012 clean. Same problem. I then pulled 2012 off, put 2008 R2 back and everything was fine again. I put together a brand new server, installed 2012 clean again and am still having this issue. Anyone else seen or heard of this?