So I had I problem when I enabled the CDN on the website, and posted the problem on FB Group, someone suggested me to ” for better performance, use tag instead of background image. That will also fix the issue.” ‘
you cannot automatically replace a background image with an <img> tag.
There are ways around it – but they could generate other issues.
I wouldn’t be concerned about the those issues GT Metrix is raising. Whats important there is that the site loads quickly. More the question is why would you need a CDN for a site that serves a very specific location ?