Could you disable the login(s) during 'processing' ?

That's what we do here to stop users logging in when we're performing a nightly bulk load - the users tend to get in the way; try and do things outside of service hours, and then complain and raise tickets that 'it was slow' -- so to avoid this and to enforce the service time, for this particular server only we just disable a handful of the logins until the process is complete.