but after Googling the problem, it seems that it is in fact a problem with Lightroom
Be specific. Where did you see this? Give us the link.
Also please state the version NUMBER of your Lightroom. We need the version NUMBER and not words like "up-to-date".
Also please state the version NUMBER of your operating system. We need the version NUMBER and not words like "up-to-date".
Give us your hardware specifications (things like make and model of the CPU, GPU, how much RAM, size of monitor in pixels, size of photos in megapixels)
Do you have installed the latest version of Lightroom? It's actually version 7.3.1
Please try to deactivate the GPU support. This solved several issues on several machines. It could be that's solves you problem too.
Did you try the solution (which was marked correct) at the link you gave??
Your GPU has no effect on performance, and should be turned off in LR (Preferences->Performance->uncheck "Use Graphics Processor")
I did try the solution. The one that said to download something and save it under the lightroom folder. It didn't do anything though.
Hmm I did turn off the GPU under preferences and that seems to be working now.