This is the issue about bad performance experience ,so I locate the priority level to most one.
The issue is like that :
Recently I found when I try to use different type of fonts expecially "wqy-unicode" type, I found the efficiency is very bad when the screen need to update .
It might be the important bug which might impact on the wide application for this software.
You could use attachment file to open .
firstly the open operation should be very slow
further, when opened, you try to zoom in/out, the response is unbearable...
you could also open another file ,then switch to this opened file, the switch response is also very unbearable....
but my file just contains limited text symbol. I don't think this is the expected efficiency. other CAD software behavior well actually.