I bought a new 4K monitor recently. It’s connected with HDMI to my laptop. The cursor is lagging when moving on the external 4K monitor. This is the second time that I noticed cursors move slow on an external 4K monitor.
The solution is on the internet. Change the Screen refresh rate to the same with the primary screen. It’s 60 hertz in my case.
And I also noticed that the screen refresh rate can cause other issues. Such as screenshot software, game, or other applications may crash.