Thanks for the reply. I had seen the Woocommerce page, which was good (except for the fact that their recommendation to change the sizes in WooCommerce > Settings > Products > Display > Product Images isn't helpful since that option is not in that location. Perhaps it's an old post. I had to dig around to find it).
By the way, your link leads to a music video! (It's ok, I saw it on the WooCommerce page.)
So here is my question: I'm trying to understand how designating a larger catalogue image size in the settings (800x800) affects load time when the catalogue image is actually shown as 480x480. Does that slow things down? Because if I were to set it back to 480x480, for example, things get blurry. I am trying to make the site run as fast as possible while maintaining clear images. Does that make sense?
Note: I'm doing this on a test site so you would not see the images to which I refer. And yes, I do understand about clearing cache.
I very much appreciate your wonderful help.