What is a Lazy loading?

Most visitors never reach the bottom of a page, so downloading everything up front spends their bandwidth and patience on things they will never look at. Lazy loading flips that: the browser fetches what is on screen, then quietly collects the rest as the visitor scrolls. On an image-heavy page the difference in perceived speed is obvious.

It can be overdone. If content is deferred too aggressively, visitors hit blank gaps while scrolling, and text that has not loaded may be invisible to search engines. The sensible rule is that anything above the fold loads normally, anything below it can wait, and text almost never benefits from being deferred.

The same thinking applies to a chat widget. Clerkzo loads asynchronously rather than blocking your page, so your headline and images paint first and the bubble arrives a moment later. Nobody leaves because a chat widget was half a second late, but plenty leave because a page took too long to show anything at all.