About the fluency

I’m a Chinese user of Agenda(mainly on the iPad Pro 2020 with the Smart Keyboard). When my note contains lots of Chinese words, the typing experience will be awful(it’s is not fluent, there is a sense of delay while I’m typing). What’s worse, just now the app was stuck, which makes me a little bit sad.
Is this problem caused by the language?

Which version do you use and about how many characters does the note contain?

he version of Agenda is 12.0.2(the newest version in the app store), and about 5,000~7,000 characters.