60hz on LG Ultrafine 4K with Macbook Pro 2016
I'm switching between Gigabit Lan, superb usb mouse and 4k@30hz - and 4k@60hz in combination with only slow WLAN and terrible bluetooth mouse on my 2016 Macbook.

I experienced the same issues with a longer monitor cable in the 60hz Setup at a customer and his monitor. The problem was solved when I used my better and shorter cable. Display was a Samsung 4k display though.