I don't think this is my imagination -- since the update last week the Epics page has gotten very slow. It loads slower, and there is a noticeable delay when clicking and rearranging Epics in the list that wasn't there before.
We use Epics all the time as a way of grouping Stories. The Epics page is a frequent one for us, and so it's made the tool much more cumbersome.
Please take a look and fix!