Miro becomes a slideshow on Safari and a 4K monitor browser window resolution?

  • 19 October 2021
  • 1 reply


I’d like to make the best use of my new 4K external display but if I increase the browser window size above a certain limit, the Miro board responsiveness drops from “smooth as a baby butt” to a “slideshow” - extremely sluggish, lagging and delayed.


Here’s a video demonstrating it:



How to replicate:

  • Open a Miro board in Safari on a 4K+ external monitor.
  • Make the browser window small, check how smooth it feels.
  • Make the window larger (width and/or height)  and at a certain point, board responsiveness dramatically drops.


Has anyone encountered such an issue?

Note: I checked that it’s happening on Safari but not for e.g. Firefox.


I’m running it on

  • Macbook Pro 13” M1 (2021)
  • External display (Dell U3219Q)
  • Big Sur 11.6
  • Safari 15.0 (view zoomed at 100%)

1 reply

Userlevel 3

Hi @LiborZ,

Thanks for sharing! We have passed your question to the Technical Support Engineers — rest assured they will follow up with you  via email as soon as there is an update. Please bear with us!