1) When scrolling down using the bar at the left side, everything disappears for a long time and I have no idea how much farther I have to go to reach the folder I need, then I am forced to stop scrolling down until the list catches up and reappears. Besides, folders do not stay still in the page, and this caused me to click in unwanted places.
2) The same moving around issue when dragging an email to a folder - it is a nightmare. The email list moves, the folders list moves, and multiple times emails were dropped in the wrong folders. It is slowing me down and causing emails to be deposited into wrong folders.