hey,
I don't know what is causing the mouse cursor lag, but as you i think it is related with graphics part in general.
Lag appears also sometimes when i move a window on the screen (quickly)
Sometimes, when i connect the dock to my laptop, only one screen turn on. I just have to unplug and plug it again.
My experience:
Surface screen alone = no lag
Surface screen + single external screen = lag
two external screens = lag
Using or not the RJ45 on the dock doesn't change anything for me.
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