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Delay in displaying web sites - browser waits for blocked Web Ads domains

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Hi,
I have a strange issue with Astaro Web Security. When visiting some websites, there is a significant lag between when the address is typed in or clicked on, and when that site is displayed. According to the browser's status bar, it is waiting on a domain in the Web Ads category, which we block. An example is The Sydney Morning Herald, some browsers will sit there for quite some time waiting for 'ad-apac.doubleclick.net'. I know for sure that that domain is being blocked, because if I go to it I'm told it's in a disallowed category. I don't understand why it's waiting for a domain in a category that the proxy should instantly deny access to.

I started with v8.301 and the results were as follows:
IE7 - ~60 seconds until page loads (I have a screencap video of this)
IE8 - ~20 seconds until page loads

I went back to v8.103 to see if the problem still existed then and the results are:
IE7 - ~20 seconds
IE8 - ~12 seconds

We're using the 'mem' CFFS option. I'm sure it's not the result of a slow Internet connection, as if I do the same test without using the proxy the page loads almost instantly. It doesn't affect all websites but I would like to know what the problem is and how I can fix it if I find more affected sites.

Does anyone have any suggestions on how to diagnose this delay, and hopefully get rid of it?

Thanks!

Daniel

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