Google PageSpeed doesn't acknowledge hummingbird tweaks

Hi Gurus,

So I tried doing a before/after test of activating Hummingbird. When I went to to test my home page.

The report that came back said I needed to:
Leverage browser caching
optimize images

Which is confusing because I'm running Hummingbird and WP Smush. Why doesn't google acknowledge the way hummingbird is doing the above?

Any advise is greatly appreciated.