[IriDium]

I've found that you can improve the performance (If it is even required) by changing the swappiness value.

By default it is set to 70 which means that the system will start swapping fairly often

The value set can be seen by:

Terminal

cat /proc/sys/vm/swappiness

I've found that setting this to 10 reduces the swapping to almost nil when using just XBian. Obviously each system is different so a bit of tweaking maybe needed.

To set the value temporarily:

Terminal

sudo sysctl vm.swappiness=yy

(Where yy is between 0 (don't swap) and 100 (Always swap))

To get an idea of the new value, it might be necessary to refresh the swap file with:

Terminal

sudo swapoff -a & sudo swapon -a

To set the value permanently:

Terminal

sudo nano /etc/sysctl.conf

and add to the bottom of the file
vm.swappiness=yy (Where yy is between 0 (don't swap) and 100 (Always swap))

I'm sure this also applies to the RPi2 - not sure about the RPi A,B and+models.