I’d like to voice my agreement with koroikoroi, that optimizing images (or css or javascript) is a good thing for any WP developer to do.
Having a plugin’s components appear upon PageSpeed’s warnings does not inspire my confidence in the author’s work …especially when they claim that their title is “lightweight”.
I have spent many days shopping for suitable plugins that do not impact my PageSpeed score. I’m trying to give Social Media Feather an opportunity on my website before I roll-my-own text-only social links.