Hi Tom, Leo
I always get an image before uploading it and compress it quite rigorously. I crop it to a moderate ( 650 x 480 example ) then compress it.
Sometimes, it is not optimumlly sized as noted in page speed analysis. What is the perfect ( ?) size for main blog post “ featured image” so I have some idea as to how it will satisfy the GP theme while not causing any re size and/ or “ compress more” issues on gtmetrix or page speed?
I read that certain themes have optimum size for images as compared to when wp uploads and resizes them.