I know there have been many discussions about this before, but I had to ask it myself:Which is the best Firewall?I currently use ZA Security Suite. Though its excellent, it blocks almost everything and you need to configure it a lot before you can actually use it. It also installs certain software without your permission like the MailFrontier Desktop. I have disabled the AV and Anti-Spyware in it bcoz they were makin my system slow even with 512MB RAM.Now, everyone knows ZA is the undisputed leader, but I need just a simple firewall without the add-ons. Even though a simple ZA Firewall is there, it slows down my system.So which firewall should I opt for? It shouldn't slow down my system and effectively block the dirt.Also, one more thing, does the simple ZA firewall also have Ad-Blocking option like its Security Suite?