It's also losing the status of inboxes. That is, it will show the orange envelope meaning you've got a message (typically someone replied to one of your comments). You then click that to see the reply, and it just sits there not responding. If you give up and go elsewhere, it often has marked your messages as read, even though you never saw them.
I'd prefer if posting and dealing with the inbox were given high priority, even if it meant more "you broke reddit" messages when I try to read stories.