A quick iperf test from my wireless laptop as server to my n900 as client shows around 6.86Mbps.

I'm using a DD-WRT'd WRT54g. Powersaving is enabled on my n900.

Well, apparently it's not the SSH encryption making my SCP transfers so slow.


EDIT:
Powersaving on/off/intermediate has no effect at all for me. It stayed within the ballpark of 6.86Mbps with each setting. I even disconnected from wireless then reconnected. Short of a reboot, I don't actually know if the settings took effect or not.