Mac Mini WiFi slows down with USB 3.0 HDs in close proximity (was: with too many USB attached)

--- Update 2/28/15:

The problem seems to be radio interference that USB 3.0 hard drives emit.
http://www.macobserver.com/tmo/article/usb-3.0-hard-drives-can-cause-wi-fi-interference

Indeed, I had my HDs real close, sometimes on top of the Mini.  Got myself a USB hub and put some space between HDs and the Mini, and the WIFI seems much more responsive now.


--- Old Post:
The Mac Mini's (2012) WiFi slows down considerably when too many USB peripherals are attached.

I had all 4 USB connectors populated when I started noticing real sluggishness.

Typically with Safari pages start to load, but get stuck in the middle and nothing happens. Progress is halted, pages stay blank.

I removed 2 out of 4 USB peripherals, and bam! All peppy was the Mini again.

Is too much USB power draw affecting WiFI?