Any MacBook Pro built in the last few years can push a 4K display at 60hz over DisplayPort.
Why I Stopped Using Multiple Monitors
Cory House

I can’t support that claim.

Eg. When I perform workspace changes, the animation is slow and laggy. It’s interrupting the focus in my opinion. But what’s maybe even worse, is that it stops me using more than 2 workspaces with that external monitor, to reduce the number of needed workspace changes. When using the inbuilt display, there are mostly 3, maybe 4 workspaces in use, just to keep the workspaces clean and separated.

I’m using a “stock” MBP 13" 2015 with an 27" 4K Monitor at 60hz.

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