Susbcription submission taking 30 seconds to respond while campaigns running


Here is an interesting new twist. We noticed only a few subscriptions from our website the last few months. so I tested the form and found it was taking 30 seconds or more for the response to "Check Your Email for Confirmation" message to show. We have 30 GB of memory on the server. I have allocated 20 GB to MySQL. Leaves 10 for PHP and other system functions.

Is it possible that a large number of entries in the Campaign Log would slow down something as simple as a subscription request? Anyone else see this sort of thing during campaign processing?