Please view my following post for my question..
Hi!
For the logo, the browser does an image optimization after the image is done being transformed. There is a small delay when this happens. If you use a smaller logo file it will be less obvious.
For your shop pages, they need to be larger than whatever you’ve set. In your case all images should be bigger than 350×350 on each edge for them to not get scaled dis-proportionally.
Best regards,
Devin