The first that you can try is to deactivate the GPU support.
Then please refer the infos on these sites:
Quote "SSD C: drive, which has 17% free space. LR is also on this drive."
This is the root cause of your problem you need at least 25% of free disk space for the operations of your computer to function efficiently.
Thank you gentlemen for your answers. I had tried disabling the GPU and I just tried it again - it doesn't change anything. I will try to make room on the SSD but I may need to replace it with a larger one.
I started getting performance problems last fall with the switch to LR Classic. After using it for a couple hours, performance was becoming so bad that I had to close LR to clear the memory.
Then, a couple weeks ago, I started having the startup problem described above. This is a nightmare, I can't use LR anymore.