This issue has been with me a while but I've got into the habit of copying an email link and entering it directly into Firefox browser. I used to think the waiting time up to 10 seconds was due to the browser opening up but I'm not so sure now.
If I put hyperlinks in word docs or any other doc. the hyperlink opens in my browser within seconds. whereas the same hyperlink in a pmail email takes forever, or so it seems. The other day I noticed at the bottom of the pmail screen there was 'Blacklist' filter activity.
Now I'm wondering if this huge delay in opening the browser to render the link is caused by pmail running filters (slowly?) in the background? What filters are running, do they consume a lot of cpu resource, slow things down, and should I disable them? I have AV and other security packages installed..