[Smush Pro] Is My Site Not Showing SMUSHed Images?

Hello!

I was trying to rectify some issues highlighted by Hummingbird and GTMatrix about site speed and noticed that both had said that my site does not seem to be serving the optimized images that SMUSH Pro is set up to do.

Is there a way I can double check on this? SMUSH is set to optimize all images on upload and delivery Lazy Loading, but both Hummingbird and GTMatrix recommend enabling Lazy Load *and* seem to note the site is serving the original image files instead of the optimized one.

Thanks!