I recently upgraded my monitor to this LG 27UD68-W 4K 27", had a few problems at the beginning such as mouse lagging and low quality graphics, the solution is CABLE.
If you are running this monitor on your Macbook Pro and facing the same issue, chances are you are running 30hz instead of 60hz.
Thunderbolt to DisplayPort Cable mentioned in this video:
https://amzn.to/2OtE4i0
LG 27UD68-W 4K UHD 27" Screen LED-Lit Monitor:
https://amzn.to/2xTe8my
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Watch video [Troubleshoot] LG 27UD68-W 4K 27" Monitor 30Hz to 60Hz (Mouse Lagging, Low Graphic Problem) online without registration, duration hours minute second in high quality. This video was added by user Tario Sultan 01 October 2018, don't forget to share it with your friends and acquaintances, it has been viewed on our site 75,961 once and liked it 570 people.