I appreciate the detailed response. However I am not talking about actually provisioning multiple machines at a time. We have pxe boot as our first boot order so that if technicians need to choose a provisioning task they can upon boot. By default we have the machines get a pxe boot ip and then proceed to local boot after 4 seconds. The timeouts occur if we simply try to boot several machines closely together without any provisioning templates scheduled. We'd prefer them to get the pxe ip, tftp instructions, and then proceed to local boot if there is no template scheduled.
Thank you so much for your help.