So I've recently come across this issue and I don't really know what keywords to use for search engines to find same issues like this. I've updated lightroom , and also my graphics card driver but nothing really fixed it. I'm sure my graphics card is being used for rendering here as my laptop temp gets higher when I open lightroom.
My laptop specs:
UHD screen (3840x2160)
Turning off the graphics acceleration seems to be a quick fix, but I'd rather use the dedicated video card as it is way stronger than the integrated graphics