In a different thread, I noted that after the fast-swipe-down (that doesn't "close" an app), the app was still taking up more RAM than I liked in the Task Manager.
Are you talking physical RAM, working set, non-paged memory?
As highlighted earlier, there's much more to memory management than meets the eye. I sometimes wish that the surface didn't expose these details, because average Joe usually has no idea what the metrics mean and would be better off with an iPad that hides all of these details, giving one no reason to complain and resort to task killers. As a developer though, can appreciate the need to be aware of potential resource issues.