[closetohome]

I encountered most of these issues, with the additional one that some games would force themselves into 3840x2160 regardless of scaling, and then run terribly.

Eventually I just bought a ~2008 30" Cinema Display and have been incredibly happy with it.

[nihonium]

30" Cinema Display is a joy. I used to have one but such a shame that it runs too hot. Living in the UK and working in an office with bad AC, it melted my face :) I let it go.

To anyone planning to use a 30" CinemaDisplay , you will probably need a special Mini DP to Double Dvi active powered adapter. They are not very common so they are a bit expensive. Search for: Tripp Lite Mini DisplayPort to DVI Adapter Cable with Dual-Link Active USB Power MDP to DVI-D, 6 in. (P137-06N-DVI-DL)

[closetohome]

My connection goes:

MacBook > Thunderbolt dock > USB-C to Dual DisplayPort > 2x DisplayPort to Mini DisplayPort > 2x Mini DisplayPort to Dual-Link DVI > 2x Cinema Displays

Ridiculous but effective.