I just got myself a DELL U2718Q 27inch 4K, connected to the MacBook (Pro 15inch Mid 2015) over Thunderbolt.
Now the new screen is running at standard resolution: 3840 x 2160.
But the problem is everything on screen is too small for me.
I tested a little scaled resolution and see 3008 x 1692 or 3360 x 1890 is more comfortable for me.
My question is whether changing the screen resolution to 3008 x 1692 or 3360 x 1890 did it affect the performance of my MacBook?
And what about the quality of scaled image resolution?