I just finished updating to 1.85, and here are the things that I have noticed so far:
-multitasking seems to be better. I am now able to switch between 3 apps without the refresh problem. However, having more than 3 apps running still has the refresh issue.
-snappier operation on menus, and faster app load times.
-battery life seems to be the same. Although I have only been on this for a couple of hours so things might change.
-quadrant score DECREASED from 4900-5100 to 4300-4500. I have already called HTC about the issue, and they said that they have no explanation for said slowdown. Note: Quadrants scores doesn't necessarily reflect real time performance, but the numbers speak for themselves.
UPDATE AT YOUR OWN RISK..
Background info pre-update: My phone was running on stock 1.73, and wasn't tampered in any way. Phone ran smooth, and benchmark scores back this up. The battery life was decent to bad with 3-5 hrs screen on time average with moderate use.