Somewhere around two weeks ago some update seems to have messed up Evolution.
For most messages it seems to take many seconds to view the message after it is clicked on. This used to take a second or less, now it can be up to 20 seconds.
One thing I have noticed is at times, it displays the message but then it takes a long time to format and display correctly. The text lines would be longer than the view window but then it formats correctly after many seconds.
I also noticed that one of my cpu cores goes to 100% while this is happening.