[djbaxter]

Originally Posted by Dave

Correct me if I'm wrong, but I've never seen or heard of vBulletin 3/4 doing a license check to their server in the code. As far as I know, there's only a check during the installation/upgrade process.

Well we now have two people saying that blocking something linked to vBulletin.com has resolved the problem for them.

I'd really like to know more about this to see if whatever it is may be contributing to my problem.

--------------- Added [DATE]1506598524[/DATE] at [TIME]1506598524[/TIME] ---------------

I've heard back from some former and current vBulletin support members and coders and it would appear that Dave is basically (although perhaps only partially) correct.

The gist if the additional information is that any callbacks to vBulletin occur only in the AdminCP and for that reason cannot affect the functioning of the forum itself.

So I guess that whatever resolved those issues for tinuz and Stingray27 were unrelated to callbacks. Either the issues were server related and resolved themselves on their own, or other changes made to plugins or something else were responsible for the improvement.

That's good to hear on the one hand. On the other hand, it means back to my research in trying to track down the intermittent slowdowns on my forums.