Let me ask you this from your experience does Avast Firewall exceed performance wise that of W7??
What do you think of as "performance"?
There are some areas Win FW can do things Avast! FW can't, see this post for such an example>>
http://forum.avast.com/index.php?topic=90141.0To break it down really basic.....Avast! FW is a quiet FW, focused on ease of use for an everyday user, meant for you to be able to more or less "set it and forget it". If you are one of those who like a very flexible FW with which to tweak, micro-manage and organize your network connections, Avast! FW might leave you wanting.