I use Layout daily at my job and also struggle with slow rendering. I have noticed that this is especially the case with high resolution displays. We work with Mac and 4K or 5K displays here. The movements in Layout are constantly jerky. A good work around is to start Layout in “open in low resolution” mode. Then everything looks a bit blurry but the models can be moved smoothly, which has already been explained here: https://forums.sketchup.com/t/layout-is-behaving-badly-laggy-and-unresponsive/126174/13?
Then there are the models with a lot of geometry. You can’t even think about clicking on the “Vector” button. There is nothing else to do than to stay with the representation as “Raster”.