Miro is meant for collaboration and supports a stable work of multiple users on the same board.
Two of our frequent use cases — PI plannings and Workshops — may involve a few hundred participants, so we constantly optimize performance for scaled-up collaboration.
The largest session we hosted so far had 377 users. Although this case is a bit extreme, the board remained operational and collaboration was successful. A more common scenario that we see almost every week is around 200 users (editors/commentors) working simultaneously on the same board.
We test our app regularly with a higher number of users, but it is too early for us to say that everyone’s’ experience will be seamless if you go over 300 collaborators. The above limit doesn't apply to viewers, so you can invite more of them to observe (with a maximum of 1000 total users per board).
The message shown to the users over the limit
Consider that the board is likely to slow down gradually with the number of users or lag to some extent during intensive user activity. Participants with older and less powerful devices will experience a slow-down earlier.
Be sure to check the tips on how to improve performance during a collaborative session.
We will update this article as we optimize performance.