*We recommend staying on macOS 10.13.3 or upgrading to 10.14.2+*
*This issue is completely resolved in 10.14.2 and later*
Installing macOS release Version 10.13.4 will cause Duet Display to not function at full performance after the OS upgrade. These features continue to work as expected in 10.13.3.
We would strongly recommend staying on 10.3.3 or upgrading to 10.14.2, which fixes the issue. Please e-mail us if you have any questions. Thank you for using duet.