I haev been trying to troubleshoot some performance issues between my Lenovo X200s with Intel 5300 802.11N network, and my D-Link DIR-655 routers. After trying things including updating firms, drivers, and the like, I also noticed that the performance of my desktop mouse was very choppy whenever I was doing wireless transfers.
My desktop mouse is a wireless Logitech MX Revolution, which is of course a 2.4GHz device just like 802.11. After some research, I found that the MX mouse receiver can interfere with a wireless router if it's "too close". In my case they were about 5" apart, since my USB hub is very close to the wireless router.
I moved the mouse received directly to the PC, about 20" away from the router, and all "mouse chopiness" has disappeared. I still don't know if it was ultimately the cause of my problems, but for better performance, make sure you physically separate your wireless router and wireless mouse/kb dongles!
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