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If you use DisplayPort, you can add as many as six external displays on an M1 Air [1]. [1]: https://www.macrumors.com/2020/11/24/m1-macs-able-to-run-six-extern

• culopatin 5y ago
  I wonder what this means for the new M1 pro then. Can I have 2 external monitors AND the integrated screen on? I guess we'll have to try
  • siva7 5y ago
    yes you can
• username190 5y ago
  DisplayPort != DisplayLink. DisplayLink hardware isn't known to be super stable - since it all runs through USB, things can get slow or laggy, and can sometimes be subjected to bandwidth limitations (at the port, the controller, etc). DisplayLink also uses software encoding, I believe - theoretically this shouldn't be an issue for the CPUs in this machine (they can handle something like that pretty easily), but there is a noticeable performance difference versus connecting them directly via HDMI or via a TB3 <-> DisplayPort connector. You're also reliant on DisplayLink's drivers, which haven't always been the best on macOS. I've heard that this was fixed more recently, but haven't tested.