Very slow USB keyboard and mouse when performing scp copy

Hello,
As the title says, my Mac becomes very unresponsive when I copy large file via scp command. Keboard seems to read only a few letters than it "sleeps" acceptin a letter every ~2s, mouse moves "by hops" over the screen.
The scp seems to use available bandwith (~300kB/s), so seems ok. The CPU is 95% idle, so again seems OK. Disk is mostly idle.
My system configuration:
- Mac mini 5,1
- Lion
- USB keyboard + mouse (combo)
What else can I check to solve the problem? I need to use ssh/scp.
Update: Just when writing the post I got an idea to test Bluetooth keyboar+mouse. The result is that Bluetooth imput devices works without degradation, whilst at the same time the USB devices gets slow. I have tested the pendrive read/write and it is also affected by the SCP command. Any ideas why SCP over WiFi degrade USB operations? Is there any USB monitoring tool/command?
I do not want to stick with the crappy standard Bluetooth keyboard when I have a split ergonomic USB keyboard. Anyway, I was looking for a good ergonimic Bluetooth keyboard but was unsuccessful. However the exclusive, either scp either USB at a time, copy operation is also a hindrance.
Thanks in advance!

Found the root cause of the problem - dying battery in my wireless keyboard. Why it degraded in operation under such condition, with SCP running, and not otherwise is a great mystery but a few days later it started to degrade all the time.

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