Hi there, I have mint 13 Cinnamon installed on one of my machines, I really like it but since I updated from Mint 11 I have the following problem on occasions.
All of a sudden the responsiveness of the system slows very considerably, for instance if you click on the menu it takes ages to scrool through to find the log out option. Logging out and back in usually solves the issue so when you start up again all is well, the machine is responsive. I have an Nvidia card and the have the driver recommended by mint installed, can't think of any other issue. Swap and Ram functioning normal.
I think it is an issue specific to Linux as the macine is dual boot and there are no problems on Win 7. My preference is for Linux so I would prefer to solve the issue.
The machine is new, quad core desktop with 8GB Ram.