I am not sure how A3 lazy load works, but for FooGallery, we set a data-src-fg attribute to the image. And only when the image is in view then FooGallery set’s the image src to be the value of data-src-fg.
Most lazy load scripts work in this way, and A3 lazy load probably does something similar.
WP’s native lazy loading is only supported by certain browsers and this point in time. FooGallery works fine with this native lazy loading.
You can turn all 3 on and they should not conflict with each other. And depending on the visitor’s browser and the implementation of A3 lazy load, they might all help with performance in certain scenarios.
Thank’s for helping me understand. I see your point about enabling yours as well as the A3 lazyload.
I could do some GT matrix tests with either one on or off but I find that the scores can vary depending on which way the wind is blowing !
I am just trying to keep things as fast as possible.