I use a dd-wrt router and wiscp far manager plugin for speeds around 500kilobytes/sec. However, when I conect the device directly to an Orient USB wifi dongle, the SSH is very unstable. The speed is around 50kilobytes/sec (sometimes 500kilobytes/sec) and the main problem - the connection often fails on the authentication stage. That's very annoying. I'm using the OpenSSH packet.
The same setup works flawlessly with other ssh-enabled smartphones in adhoc mode.

I think the problem is, the n900 idles or uses slow clock speed when you're not typing or tapping the screen. I don't know how to fix that.

I'm using rsync over ssh, it works pretty fast if I keep tapping the screen or typing, but otherwise even if I've set the clock to minimum 1150MHz it goes slow at 50kB/sec after a little while. So I guess the CPU is going into some idle / resting mode, and the decryption speed is suffering as a result. How can I prevent that so that rsync will keep running fast when I'm not tapping the screen?