You should put your computer specs and software version in your signature. It may help to narrow down the problem. Several possibilities come to mind. You could have a problem with an SEO operation run amuck. Could be video driver or card problems in OpenGL.
Gerald
"The simplification of anything is always sensational" GKC
AC 25-4013 USA, CadImage Tools
2019 MacBook Pro 16" w/ AMD Radeon Pro 5600M GPU
OS X 11.6
2.4 Ghz 8 core i9, 64 GB RAM
27" LG 5K Monitor