Dianara redraws
Dianara redraws whole timeline for each update, so it is annoying when I am reading a long post.
Yes, that's a long-standing issue. The proper way of updating is half-done, but for the moment, you can click on "Comment" on that post, which will block the updates of that particular timeline.
Try clicking comment on any post in the main timeline, and pressing F5.
It might also help to increase the timeline update interval in the settings.