I've always been content with the bright orange on my G710+ but decided to change things up as it didn't match anything in my room. I had some left over spray paint from some previous work and thought I'd try it out.
Some things I thought of to check:
What is your CPU utilization on Windows? I seriously doubt that CPU would have issues though. Just a thing to check.
Since you are on Windows, you are using Samba to connect to the shares. Samba can only use a single core on the CPU for handling network traffic. Again, probably doesn't matter, but something to be aware of.
Open your Network Adapter page (right click network icon -> click Open Network and Sharing Center -> Change Adapter settings) and right click the adapter.
Click Properties -> Driver -> Update Driver.
Or go here and get your OS' LAN drivers for the motherboard (if you haven't already ofc).
Also, go back to the Adapter Properties and go to Advanced Tab then go down to "Speed and Duplex". See if 1.0 Gbps Full Duplex is an option, and if it is, switch it to that as a test (switch it back after testing file transfers as you want it on auto if you don't have an issue with auto).
Are you using TeraCopy? Just curious. Avoiding Windows' specific stuff is a plus usually.
Based on that image, you are not using TeraCopy. I recommend trying it, if only to find out there's a better copier out there (imo) than Windows' default.
I found the following through Google of things you could try: http://superuser.com/questions/94715/windows-7-file-transfer-speed-over-gigabit-is-slow http://www.computing.cc/windows-vista/how-to-fix-slow-shared-network-file-transfer-on-windows-vista/
https://social.technet.microsoft.com/Forums/office/en-US/5fa159e3-2053-4d8d-b0a9-11424c7eb196/are-you-seeing-slow-windows-7-network-performance?forum=w7itproperf
You could try iperf, as mentioned in the second comment here: http://forums.anandtech.com/showthread.php?t=2311497
Be sure to run it in UDP mode or increase the window size (how much data is transferred, basically).
