Xcode: Version 15.3 (15E204a)
STTextView: 0.1.4
Mac OS: 14.6.1 (23G93)

please update to STTextView 1.0.0 and try again, if that wont help you can try main branch

please update to STTextView 1.0.0 and try again, if that wont help you can try main branch

The same problem persists. I believe the computer’s low efficiency plays a significant role in processing long text slowly, and I think this might be why the text disappeared. I believe that newer computers are about 5 to 7 times faster at processing. Based on that, I suggest trying a text that is 7 times longer, which might reveal the problem.

thanks for reporting that. I believe that is unfortunate bad performance in textkit2 layout engine when trying to layout whole document - that in necessary to jump to the end of the document position. There’s quite few reports to apple about that and I only gor reply that is supposed to be improved in macOS 15. just few days ago @simonbs posted DTS to apple https://developer.apple.com/forums/thread/761364?answerId=799479022&replyId=799479022&login=true about that very problem.

That is not trivial problem s
to solve unfortunately, but is not dismissed at all. Hopefully we manage to come up with usable workaround to make it more performant

Please check the answer provided by the Apple DTS engineer.
https://forums.developer.apple.com/forums/thread/761364