Video stuttering in mirrored set up on Mac mini

Hello kentmcpherson,

This stuttering is simply due to the fact that your Mac is trying to synchronize two screens that do not have exactly the same refresh rate (Hz). To adjust this, go to System Settings > Monitors, click on each of your screens and make sure they are manually set to the same frequency (for example 60 Hz both). In the mirroring options, also check "Optimized for" by choosing the screen that jerked, this will force the Mac to stabilize its image as a priority, and the power of your M2 Pro will do the rest without problem :)

Thank you for your feedback. If the frequencies are the same and optimization simply moves the problem, it's probably because of the vertical sync (V-Sync) that macOS only applies to the main screen in mirror mode. To get around this, try changing the resolution of the mirror screen in System Settings > Monitors by choosing a "standard" resolution (such as the native 1080p) rather than a scaled version. If this persists, an excellent software alternative is to go back to "Extended Desktop" mode and use a free application like OBS Studio, you just have to open a preview window of your simulator on the second screen, which completely eliminates the stuttering of native mirroring.