Hi,

the problem is the current version of Zone Alarm.

We have exchanged a few emails with the developers from ZoneLabs/Checkpoint and indeed they admitted there is a problem in the firewall. On Vista, Zone Alarm causes a slowdown of several seconds on every incoming connection. This happens regardless of the fact if avast! is installed on the machine or not. Only that with avast! installed you see the problem more quickly, since WebShield accepts a lot of connections from your browser.

Other applications, like any ad-blocker, parental control, anonymizer, regular HTTP caching proxy, and even IIS or Apache Web Server running on Vista with Zone Alarm (simply everthing that accepts connections) is really a bad bad idea. At least in the current ZA version.

However today we were informed that ZoneLabs team had finally found out a fix for the problem. It should be out in the next Zone Alarm version (but we don’t know when this is going to be released).

If you really like Zone Alarm, we suggest either turn the WebShield off, temporarily, until the fixed ZA version will be out, or at least configure your browser to use the proxy on localhost:12080 manually (don’t use the auto-redirect). By this, you will be still hit by the slowdown, but since the browser is trying to keep the connection active as long as possible (when configure to use proxy manually) the slowdown may be slightly less obvious.

Cheers,
Lukas.