Lag time when clicking Post Reply & Post Topic

I have a BuddyPress site on the Social theme - http://denvertherapistsnetwork.com/ - and I have always had issues with users submitting multiple replies and topics because of the lag time when clicking the Post Reply and Post Topic buttons. And I regularly here from customers about this frustration - and many don't notice, so 2-4 replies or topics will get posted.

I recently moved the site to a new server and I see no performance issues and it seems I have heard others mention this as well. The site is completely up to date as well.

Is there anything I could be missing? Any setting? I would love any thoughts or ideas that I could look at to address it. Even if it was possible for the button to change to "sending" or something once you click it once.

Thanks, David