Large projects in Ulysses appear to be a no no

I have used Ulysses for more than three years but my experiences in the last few months lead me to believe that Ulysses has a problem rendering sheet names, especially in the context of a large writing project. My attempts to navigate and select sheets displayed in a sheet listing often resulted in an entire list(s) of sheet names scratched out by multiple horizontal lines where the names are no longer readable. I tried to get rid of horizontal lines, but they always return without any warning. Working on a large project with this kind rendering behavior became a huge distraction for me. The problem became so severe that I decided to move my entire writing project to another writing platform. Ulysses support is aware of the problem, and it is believed to be an issue with the Mac OS.

MorganHill about Ulysses – The Ultimate Writing App, v2.7.2