Not sure if this is still a problem but the, check for new updates, used to kick in everytime the device connected to the internet, slowing it down a lot.

I changed the time between auto checks to 7 days and it made a huge difference to the usage.

Can't remember where the setting was now but it's mentioned in the forums somwhere.

rgds

ps. oh and swappolube seemed to make things much better too.