I'm using a 13inch touch-bar MacBook pro with a Samsung U28E590 4k monitor.
I'm very happy with the resolution on the MacBook's screen and everything is a comfortable size. However on the monitor the "default for display" (which says "looks like 1920x1080) makes everything huge and sacrifices the amount of space on the screen.
If I go into display preferences and choose the middle option (3008x1692) this is a good size, but it has a noticeably bad effect on performance - window switching, resizing etc is jerkier and slower.
The setting I currently have it on is "more space" (3180x2160) which doesn't suffer the performance issues but makes everything tiny. I have to zoom in on any applications I use in this monitor (mostly terminal and text editors).
Is there a nicer solution to having a comfortable resolution on a screen like this without sacrificing performance?