I've had the N810 for 6 months now and have tried out all kinds of customisations and hacks. I try things and then uninstall them, I've even re flashed and reinstalled from a clone but it made very little difference to speed.

So this weekend I backed up my files and reflashed... I then manually installed only the programs that I have used for the last month, and what a difference it has made! The N810 is quick and brilliant once more, I really can't recommend doing this enough.

I even dragged back the reference files for Claws, Skype, Gftp, and Erminig so that I didn't have to re enter information. It took a few hours but was well worth it.

I know have, in no particular order:
Claws mail
Easy debian
OpenSSH
flip clock
The GPE Suite
Load applet
Advanced backlight
console tools
Gftp
Leafpad
Hex a hop
Skype
Maemo Mapper
Pidgin
Stardict
Evince
Maemopad plus
Maemo recorder
Wifi info
Xarchiver
Personal menu
Vagalume
Mplayer

And still have 55mb free on the main drive! I never got above 20mb with all the other stuff I used to install.

Just need to find Xournal again and I will be set.

Hopefully this might help someone else.

Steve