We use the blog module from GP Premium to display the Featured image of a blog post.
That works nice, the image is displayed to the website visitor at the right size on both desktop & mobile and anything in between, neat and responsive.
However, the Google PageSpeed Insights tool results tells its getting served the original image files, resulting in a low mobile and desktop pagespeed score.
The file that is being served to desktop / mobile seems to be the original file that is uploaded as featured image.
Is it not filtered though one of WordPresses image sizes (thumbnail, medium, large, etc)?
The same goes for the images we upload in blog posts.
I’m assuming the theme’s job is filtering blog post images through the WordPress ‘image sizes’ so they are adaptive in file size (as well as them being shown in the right resolution on the right device, responsive). (and that GeneratePress does this)
Or do we need a bit of extra configuration?
I seem to be missing something here, hope you can help.