HDMI Connected Monitor Causes USB Performance Issues?

Last week I added an HDMI monitor to my workplace environment. Now along with the earlier VGA monitor connected through an adapter, I have two displays running on my 15" Autumn 2014 MBP--fully loaded. Displays are crisp and clear, but I noticed that my wireless keyboard and mouse were misbehaving terribly.
I have a 2-3 year old ergonomic wireless Microsoft keyboard/mouse combination that attaches via a dongle on any USB port. Issues involved non-responsiveness for long periods of time, general key skipping, and mouse jumpiness.
So, I bought a brand new one--the Sculpt Ergonomic with the mouse. Plugged it in today and, lo and behold, I have many of the same issues.
I can use either of the USB ports on the machine, but still have problems. If I type using the laptop's own keyboard or move using the trackpad, I see no issues. If I remove the HDMI cable all of the issues disappear.
Having no other USB peripherals to check against, I am suspecting that there is an issue with either the USB or the OS management.
This bad boy is loaded and very new and should not be having issues:
OS X Yosemite 10.10.2
2.8 GHz Intel Core i7
16GB DDR3.
Can anybody else explain this?

Inspecting it now...
It's a 60W magsafe1 that I got for my Macbook Air 2010 (I believe that was the year).  Genuine Apple product.  3-prong properly grounded.  Definitely quite old and looking a bit disheveled. 
Could it be that I was using a 60W instead of the 85W that is designed for the Macbook Pro?

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