I have recently upgraded to a core-i7 system and now all the apps from mate (GTK2 based) are very slow. Basically when I switch to a workspace that has a couple mate-terminals open, they are redrawn as if these were sent over the network. GTK3 apps and firefox work properly and are refreshed instantly. I'm running Debian testing. I have tried to reinstall xorg and related packages and everything seems to work fine except for this. Here is my xorg.log. Any hints?