Videos are significant assets that can slow down web page performance. Modern browsers now support lazy loading for video elements, deferring downloads until a user is likely to watch them. However, this feature is not yet universally supported across all browsers. Currently, Chromium-based browsers like Chrome, Edge, and Opera support native video lazy loading. Firefox and Safari do not yet offer this functionality. Lazy loading delays video downloads until they are close to entering the user's viewport. This reduces initial network requests, bandwidth usage, page load time, and memory consumption. Using a poster image provides a preview, improving perceived performance and reducing initial network demands. For videos below the fold, further optimization can be achieved by loading them only after user interaction or using an Intersection Observer. This provides a fallback for browsers lacking native support. Best practices include lazy loading off-screen videos, using poster images, compressing videos, and considering alternative loading strategies for wider compatibility. Implementing lazy loading, especially with poster images and fallback methods, significantly enhances the loading experience for media-heavy websites.