Thanks @NeilUK - You confirmed what I’d assumed about not having control over what the theme provides and this is the exact reason I didn’t want to unfairly mention the theme.
Totally agree about focusing on what I have control over. In hind site, I should have asked if this was something I could adjust or not. I’d assumed no, but wanted to make sure.
Also, your comment about Google failing their own test made me laugh. This is sort of an example of: I can make it fast for Google, but users will hate it or I can make it nice for viewers and not worry so much about Google. Just looking for low hanging fruit in this case.
I will say that some of the tips google gave me are quite helpful. For example, there are some images that snuck into my site that are very large PNG images that could easily be JPG without any noticeable loss to for the viewer.
What was also interesting was Google recommending JPEG2000. Sort of though that standard never got legs and died. Interesting to see that recommendation.
Many thanks. Have a nice weekend.