I would update the appliance to v7.3X. That would solve half of your problems. Astaro has done a lot of tuning to v7 since the 7.2 days including a new sql backend. Login to your machine and under the Support tab--> advanced, look for running processes just to make sure its the proxy and not the logging killing your asg. You can adjust the logging accordingly till you update, plus try disabling the http caching and see if that helps also.

Although if I remember correctly, it was broken and wouldn't go above 17MB. See
http://www.astaro.org/astaro-gateway...ache-size.html

Although the new http proxy is not as configurable (via shell) as squid, I find it a lot faster than v6 squid proxy with the right amount of ram. As far as speed test, you are correct. The virus scanner is downloading the file that the speedtest site is sending you, scanning it and then your browser gets it all at once so you get those high speed numbers. You can try to add your speed site to bypass virus scanner etc. and you will get correct results. Just make sure you bypass the correct site since sites like speedtest.net don't host any tests locally and are all from external hosts.

HTH