The delay between clicking a Message in List view and it being displayed is too long (> 100 ms) and makes the overall message browsing experience feel very sluggish. I'd like Messages to render instantly, possibly in a preview mode or as plain text. And I'd also like the keyboard based navigation of messages to not be delayed by the rendering of the message view. Ideally browsing is as snappy as navigating the Filesystem in Finder and Quicklook previews.