Move the generation of the initial a4 page count into a low priority thread.  It was taking up way too much time on the event thread and is only used in the word count sidebar.
Move the generation of the initial a4 page count into a low priority thread.  It was taking up way too much time on the event thread and is only used in the word count sidebar.

garybentley/quollwriter,garybentley/quollwriter