Change the images src attribute in the service side, so as to achieve a real lazy load, and is compatible with all browsers.
Tried a lot of others plugins for an specific site that for some reason refused to do lazy loading. This one worked for the situation so it's ok as an alternative.
A real lazy load of server images is great and this plugin provides that. However, if the visitor does not have a fast bandwidth and is scrolling down the page, the images will appear a few seconds after they are scrolled past due to loading time. Plugin should load images "3 page heights" down in order to try to anticipate this behavior.