The HDMI port is not version 2.x along with the right HDMI cable (that's very rare!)
If you can connect with VGA you may do better.
I bought a new 4K monitor yesterday (LG 32UD59) and attached to my ASUSPRO B9440UA laptop.
(CPU: Core i7 7500U - VGA: Intel HD Graphics 620 - RAM: 16GB)
My display on the monitor is laggy, I was checked the refresh rate, Max rate is 30Hz & I can't increase the refresh rate to 60Hz.
I'm using the original manufacture HDMI cable.
My Display Driver version is 18.104.22.16886 on Windows 10.
Help me, please.