Dell Server running 2012 R2 w/ SSD's, Dell workstation running Win 8.1 w/ SSD's.
I wanted to make a copy of a vmhd file so I just did a local copy/paste on the disk where the vmhd file was. When the file transfer graphic looked pretty inconsistent and the copy took a while, I thought I would try a PC to PC copy over my 1Gig network.
The PC to PC copy was significantly faster (more than 3x).
Why is that? All the disks involved are SSD's.