The [Carbon/Quartz API](https://developer.apple.com/documentation/coregraphics/quartz_display_services?language=objc#1656506) says it only supports: > [The refresh rate, in hertz, of the specified display mode for a CRT display. Some displays may not use conventional video vertical and horizontal sweep in painting the screen; for these displays, the return value is 0.](https://developer.apple.com/documentation/coregraphics/1454661-cgdisplaymodegetrefreshrate?language=objc) It'd be lovely to circumvent that somehow Previous instalments: #22, #17
