I have been browsing the web with my google chrome in the manual sandbox for over 2hrs and the avast! firewall is using 1,200k of RAM and the other two processes are using 3,100k and 2,800k. I thought the free version was light on resources, but damn, AIS is even lighter. I also really like having my browser sandboxed, as it makes me feel invincible! lol
I don't mind supporting avast! when they make software like this.