[Gllug] squid - regex for blocklisting

[paul]

Hi everyone

I have been experimenting with a squid proxy and have a question about the 
correct method I should use for adding blocklists of url's and domains
that should be blocked.  When I first did this i used this 

acl banned url_regex -i "\etc\squid\bannedlist.txt"

It worked fine for a while then as I added more url's it slowly dragged the
server down to a grinding halt. I then searched for the correct way and
found this 

acl banned dstdom_regex -i "\etc\squid\bannedlist.txt"

Can anyone give me a succinct explanation of why the two are different and
what implication that has when the list is processed please. Also could you 
let me know if there is a better method than using regex to achieve this.
Thanks
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