I used for a while mint13 with cinnamon desktop, i got big problem,
it often freezes, and the screen stays like this until I reboot the machine!!!
So I decided to install mate, et use it at it place, then the problem disappeared???
I used it on I giga memory machine so no memory problem i think.
May be so daemon is started as root and consumes all the resources from time to time ???
thanks a lot