Thank you Naughty, I have been suffering with this problem for ages, untill I could not stand it no more and tried to look for a solution. I made a reinstall of firmware through Nokia Softvare Updater, but did not help at all. But this community SSU is simply awesome, I now have it powered on few days(before I had to restart every day) and experience no lag at all. My N900 is now fast as I always wished it to be. I recommend this to everybody!