I've noticed Jive is really sluggish this week. Pages take a while to load and while I'm editing it gives me messages that there's a problem and I can't save what I'm working (it's a big red message that appears at the bottom of the page.
Reviewing through your description, I would suggest submitting a case in your customer group ( MyJive Secret Support Group Administration FAQ ) as a next step, where a member of our support team can assist with investigations specific to your instance. When submitting the case, if you could also review through and provide the following type of information - Turning "It's too slow!" into - it should assist with their investigation.