The screen is a Samsung U28D590 3840 x 2160 @ 30Hz (max reso on intel 4000
graphics) via a Thunderbolt->DisplayPort cable. Initially not directly
supported, that is, the resolution was not recognized by the OS as-is, but
has been enabled with the SwitchResx app here  which
somehow tweaks the system telling it about this new resolution. Many use
this utility app. It runs OK from the start since summer 2015. Pharo 5.0
runs fast and stable without problems. 

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