This issue is intermittent, but correlated over time.
Essentially, when typing in rich text entries, and sometimes also in simple text entries, there’s a substantial lag in typing and the characters appearing. It’s somewhat understandable when it’s a reference, but in many cases this happens just when typing normal text (although I think it’s worse when there are many reference in the text).
I get this issue in all three browsers, and my internet is quite fast (no such issues in say Google docs, or anywhere else that I’ve noticed).
I’ve taken to writing up notes elsewhere and later pasting them in - works fine if the field doesn’t need to have many references, but this isn’t a workable solution if many references are there.
I believe this is worse with multiple people editing a doc at the same time. As mentioned, often times this isn’t a problem at all, and sometimes full seconds will pass before text appears on the screen. I don’t use Notion much, but I’ve heard similar complaints there.