you can download task killer from the market in nitdroid which can help free up ram. this improves performance

Download overclock widget from the market and use that to overclock. this works just as good. however you have to change the frequency everytime you boot into nitdroid. use that to change the freq and see which one you think is the best and to make it permenant follow the underneath instructions

1- install filebox from app manager in maemo
2- open filebox and go to settings and turn on root
3- go to /home/etc/power.conf
4- highlight that file and edit it
5- change the following like this

scaling_max_freq 850000
scaling_min_freq 250000

save it.