I would understand if it is possible "to unload" the contents of a div after scrolling a page that hides the div itself.
That is, I have a div with a pretty animation heavy (on older computers) and I would like that appears (and therefore the browser becomes heavy) when the user is viewing; then, immediately after the scroll of the page (and thus leaving the div "at the top" of the page) that div I would like "to unload" and make it disappear so as to make lighter the page.