Description of problem:
So customer have one Host Collection with ~ 400 content hosts, all of them RHEL7, when customer click on Errata tab just to see all erratas available to all 400 content hosts the spin still forever, if customer keep the session alive, working with another session, he told me, one time was possible to see the result after 30 minutes, btw when doing any filter, stopped work, then was necessary redo the steps and the same behavior.

I create one Host Collection with 2 content hosts, worked as expected, faster.

Version-Release number of selected component (if applicable):
6.2.7

How reproducible:
100% on customer environment *with 400 content hosts*

Steps to Reproduce:
1. Create one Host Collection
2. Add 400 content hosts
3. Click on Host Collections - Errata Tab

Actual results:
spin still working forever

Expected results:
See all erratas available to all content hosts

Additional info: