Just ran a Hummingbord Test and noticed a poor score for "Serve images in next-gen formats" a 65. I just double checked Smush Pro and all advanced features are enabled, including deliver in next gen formats as well as deliver in correct size. I re-ran smuch pro image check to see if it detected any of the images flagged by performance test, nothing.
So I'm not clear which to believe. Do I believe the settings of Smush Pro which indicate that dynamic sizing and next-gen formats and compression have been applied, or do I believe hummingbird test which seems to be saying that images are not being properly compressed and scaled and delivered in next gen format?