Sounds like you tend to store contents internally.
So, I probably won't be helping you solve this freeze problem in the near future. I generally stay away from
Store Contents, therefore using a combination of <Ctrl+Q> on the URL attribute or embedded hyperlinks to edit documents externally. As alluded to, when I feel it is appropriate, I make good use of copy & paste from such documents to make pretty stuff appear in the item text area.
