Really 5 minutes?If the slow responding occurs even when the email verification is disabled then I think there must be another reason in your environment that is responsible for this. By the way: if the email verification slows down your osticket the system has problems to make the dns check for the mail domain of the address.You should tell more about your environment and the situation when it occurs.I don't really understand what "replay to a ticket that is on a group with 10 client user" means.