Computer become very slow if left on.

[Derek Broughton]

Davide Corio wrote:

>> Now, if I leave the machine on overnight the next day the machine
>> starts responding very slowly.
...
>> I can't even do a proper shutdown/restart because the response is too
>> slow. Slow as in taking half an hour to do password checking etc.. I
>> have to switch it off at the power button.
> 
> I'm having the same problem on my dell latitude d820 core2duo 2Ghz and
> 1GB of ram

# swapon -s

It sounds very much as if you aren't actually using swap.
-- 
derek