Smush does not smush 300x224 Wordpress generated images


This website has been smushed.

However the page load speed is still 8.72s

The GTMETRIX report here

Says that Smush did not decrease the file size of wordpress generated thumbnails.

Also, the front page of Cleverworks is running a Marketpress products shortcode.

Are the page load speed issues caused by Marketpress or WP Smush Pro?

Any ideas?