This is the method i used, but i still don't see any performance gain. I can see the ramcache is working properly by entering:
$ df -H | grep ramcache
output:
$ tmpfs 210M 2.3M 208M 2% /ramcache
and both files are being used while the game is running.
also Has anyone figured out how to stop the game from switching between low/high res textures, randomly while your playing? It's not enough to kill the experience. but it dose lag for a split second every time it decides to do it. which can be every second, or every minute. and everything in between.