Don't have a Netflix account, but I just tested with a bluetooth mouse and my bluetooth music receiver.
If I just have my mouse connected (but not using it), it doesn't slow it down much at all, but if I constantly move the mouse around while the speed test is occurring, it does drop the speed quite a bit. However, the speed drop is nowhere near the lever you are seeing....
I get very little slowdown while playing music to the bluetooth music receiver while running the test.
I think the slowdown while constantly moving the mouse around might be more CPU related since the bluetooth music receiver doesn't slow it down much (still get about 12Mbps download while sending music to the bluetooth music receiver).
I would expect the slowdowns I'm seeing though, especially since bluetooth and wifi use the same 2.4Ghz signal....
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