Ideas

Lazy loading is now supported directly by the browser itself by adding the loading attribute to the image. The default Accelerator should implement this wherever applicable (product listings for example) to have a minimum implementation of lazy loading. If possible, add some simple logic for when to add it to blocks automatically.

https://web.dev/browser-level-image-lazy-loading/
Polyfill exists: https://github.com/mfranzke/loading-attribute-polyfill