Now that I have #Eleventy v3 installed, I finally implemented the 11ty image optimization plugin. The before and after is pretty striking. I have an image-heavy site at Cybercultural.com, so in one of the latest posts the amount transferred to the user is 4 times less! 800kb vs 3.2MB before. Also, it doesn't all download at once — that's 800kb only if the user reads the whole post (which I hope they do, of course).