Briggs Softworks

Is there any kind of throttling on the callback function? I ask because I have multiple servers that report to the same database, and we've noticed during busy periods that events on the primary server will not appear in our event log until several minutes have passed.

No, they all go into a central queue and callback thread makes the calls as fast as it can. On a busy system, a more efficient way is to enable "Save callbacks to file" and pull that file on a timer using LogsCallback in the API.