Great except slows down to a crawl

I find the app well-presented with a pleasant font and just enough of the critical features I use in serious writing. The main issue is after a while writing whether its time or amount of actual text written, but the whole app slows right down. I need to pause and let the cursor catch up. I have exited every app I have running on my iPad 4 and it still does the same thing. Especially scary when saving or exporting it looks like it froze. I cant use it as is-please take a look and see if you can find the issue.

Jjayw about Byword, v2.1.1