Works as expected, huge improvement

The plugin just adds the loading=”lazy” attribute, which works fine, the rest is done by the browsers who support it, which will soon be all relevant ones, since Safari is about to implement this feature. This is a huge improvement for the web platform and web performance in general, I can’t even imagine the amount of data (and thus time, energy, CO2, money…) this will save once WP implements it in core.
The lazy loading experience itself is ok – you DO sometimes see images pop up, but that’s a price worth paying, and browsers will hopefully improve this by starting the loading at just the right time.