@Rich-O-Brien
Sorry, I do not think the graphics are the issue.
Something about megascans when I restarted Sketchup after making the changes in BIOS.
I am seeing a thirty second or more delay when selecting, painting a surface or importing an object which is something I have been seeing anyway. SKetchcup can take a minute or more to load to the welcom screen and then open a model even one saved to the OS drive.
Having said that, I sometimes get a onedrive saving error "Cannot save, this file is already in use by another user", this turns out to be a one drive folder in my microsnot account. These two renders were consecutive and I have no clue. The bonus is that in true architect fashion, the second render does bring the garden "Indoors"......

