Not with me. My test instance is in my hallway closet at home, on a simple upBoard. with a home 200/20 connection. I am about 75km away. The other user is 1300km away. I am on a business connection (huge). The other users on some lowsy orange connect 1 to 15Mbit adsl.
Using it remote with two different users looks like there is no lag at all.
Of course this would change with more users. But the CODE is restricted to 10 opened documents and 20 concurrent users anyway.
https://help.nextcloud.com/t/collabora-document-limitation-by-purpose-10docs-20connections/4425