Yeah, this was a major issue.
I literally, could not use this phone out of the box. It would unload everything I was using, not even a full minute after being out of application.
Home launcher would be unloaded in 45 seconds to a minute and a half, unless I was staring at it. Tabs in the browser would be gone in 30 seconds, forcing page reloads. How can HTC release a phone that's inferior in terms of overall usability and speed, over their last phone (the 3D)??
Even WITH optimization, this phone isn't any faster than the 3D was. It's stronger graphics wise, but none else.