Slow Site, Images Not Optimizing With WP SMUSH

Hi,
I have WP Smush Pro installed and have been through the process of compressing my images. However, when I run my site through the google pagespeed insights, I get the following:

Optimize the following images to reduce their size by 2.2MiB (73% reduction).
Compressing http://sewardhelicopters.com/…seward-helicopter-tours-bear-glacier.jpg could save 446.7KiB (72% reduction).
Compressing http://sewardhelicopters.com/…uploads/aialik-glacier-seward-alaska.jpg could save 423.3KiB (72% reduction).
Compressing http://sewardhelicopters.com/…cier-dogsledding-tours-seward-alaska.jpg could save 410.9KiB (71% reduction).
Compressing http://sewardhelicopters.com/…/uploads/glacier-dog-sledding-alaska.jpg could save 379KiB (73% reduction).
Compressing http://sewardhelicopters.com/…rd-alaska-kenai-fjords-national-park.jpg could save 155.4KiB (74% reduction).
Compressing http://sewardhelicopters.com/…content/uploads/seward-dogsled-tours.jpg could save 149.5KiB (74% reduction).
Compressing http://sewardhelicopters.com/…loads/seward-icebergs-scenic-flights.jpg could save 147.4KiB (76% reduction).

Any help would be appreciated.