For performance reason, I’ve set Images > Image width (px) to 400 in all my WP Show Posts category.
However, when I want to use Columns > Featured post for a specific category, 400px feel too small so i bump it to 550px or more in order to have a bigger Feature post image. The downside of this approach is that now all my image are using more pixel and it affect negatively my performance.
Is there any way to let all image to the 400px settings but to have a bigger setting for the Featured post image?