[creedo]

I just figured out something that made a VERY noticeable difference in speed, at least the speed when scrolling between the clock screen and icon screen. Just set one wallpaper for all tabs. Go to to menu -> set wallpaper and remove the wallpaper you're using for portrait mode, then make that your all tabs wallpaper.

The scrolling becomes as snappy as a when you first took the phone out of the box.

You can still have a separate landscape wallpaper, but I noticed that over opening the phone and closing it again, the scrolling slowed a bit.