Optimized images have wrong resolution

[Manuel Klöffel]

I have a bunch of images on my page that have no width or height tag as they need to be responsive. Pagespeed will always optimize these with a wrong resolution, instead of using the 300x300 images as included on my page, it will resize them to 53x53 and then "magically" save about 80% in filesize. There is no reference to resolution for these images in my code, neither my markup nor my css - why is pagespeed resizing these images?

[Rick Steinwand]

Wrong forum.

For mod_pagespeed discussions, please go to https://groups.google.com/forum/#!forum/mod-pagespeed-discuss

[Independent Ekspos]