Following up on this older post, apologies for the delayed reply! 

For those who might find this thread in the future, we recommend reviewing the Board performance and loading issues documentation in the Miro Help Center as a starting place if you are experiencing slow load times. 

If you’ve gone through all the troubleshooting steps in the doc above but are still experiencing slow load times, please report the issue by Contacting Miro Support. 

Thanks!