Two developers build the same page. Same images, same form, same content. One loads faster, scores better on Core Web Vitals, and feels smoother on mobile. The other does not. The difference is four HTML attributes. Each one takes about thirty seconds to add. Each one has a real, measurable impact on the people using your page. Here is what they do and how to use them right. Here are the exact code examples: loading By default, the browser fetches every image it finds in your HTML immediately, even the ones three screens below the fold that the user may never reach. On pages with many images, that is a lot of wasted bandwidth upfront. The loading attribute changes this.…