Well lately my 11.10 has been incredibly slow and I don't know why. Like everything is always really slow. Moving Windows across the screen or minimizing/maximizing is extremely slow. I don't know if the animations or what, it's just miserably slow. This was not happening in Windows7.
lspci -d10de: -vvnn
and add the output to your question.free -t -m
when your system is slow? And could you tell us, if there are high %CPU numbers withps -eo pcpu,args | sort -k 1 -r | head -10
(you don't have to post that output if you don't want, just if there are high numbers).