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I have a new 2018 Retina MacBook Air, 1.6Ghz i5, 16GB memory, Intel UHD Graphics 617 1536 MB. I am connecting this to an external monitor, a Dell P2415Q, using an HDMI cable and a Targus DOCK412USZ

My issue is that the output on the external display is very laggy and noticeably slower. The screen also flickers occasionally.

I have tried using a different resolution on the external monitor, which did not solve my problems. I've also tried using a DisplayPort to Thunderbolt cable, which also did not solve my problem.

What can be done to resolve the lag issue?

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