smush pro not optimizing according to Google Page Insights

Hi Support! I am beginning my trial of WPMU and have a question concerning the smush pro plugin. I am trying to get all my images optimized. I have performed the optimization using the super smush compression. However, google page insights still advises me that my images need to be optimized. Here are a few screenshots.

I have added you to the support so you can access my site.

Thank you,