import-on-visibility

To lazy-load React components when they enter the viewport, use the IntersectionObserver API or libraries like react-lazyload to dynamically import below-the-fold content only when it becomes visible, improving initial render performance.

Visibility-based lazy loading is a web performance technique that delays the import or rendering of below-the-fold UI components until they enter the viewport, preventing heavy widgets and images from delaying the initial page render.

To show a loading fallback while lazy loading a component, wrap your component with a visibility-based loader that supports a loading fallback component, displaying it until the module or component fully loads for a smooth user experience.

IntersectionObserver works with Vue for lazy loading below-the-fold content by detecting when elements enter the viewport to trigger dynamic imports, reducing initial render delays for heavy widgets and images.

Use visibility-based lazy loading for UI components when you have below-the-fold content like heavy widgets or images that delay initial render, applying the IntersectionObserver API to import them only as they enter the viewport.