Word count performance is poor on large files

Word count is causing extremely noticeable delays in some large files, e.g. 10,000+ words.
At present turning the word count setting off only hides the display, making the performance hit unavoidable, see: https://github.com/ChoicescriptIDE/main/blob/0f75594d9357e7dcf3f3bee4dae0fb71ec2f6c3f/source/js/knockoutCSIDE.js#L1015

At the very least an option should be provided to disable this properly, but it would be best if the base performance could also be improved in the long run.