Core Web Vitals describe how a page feels to the people using it: how quickly the main content appears, how soon the page responds when someone interacts with it, and how stable the layout stays while it loads. Designers influence all three, often more than anyone else on the project. The images you choose, the fonts you load, the animations you add, and the space you reserve for content all shape the experience a visitor actually gets. Improving these signals is not about chasing a score for its own sake. It is about removing the small frustrations that make people leave before they have read a word.
Lighten What the Page Must Load
Heavy pages are usually heavy because of design choices. Oversized images, background videos that play automatically, and several decorative font files all add weight before the main content has even appeared. Resize images to the dimensions they are displayed at, prefer modern compressed formats where your workflow supports them, and ask whether each decorative asset earns its place. A page that loads only what the visitor needs will feel faster on every connection, and it is far easier to maintain than a page patched with workarounds later. Test the result on a phone as well as on a desktop, since visitors arrive on both.
Fonts deserve the same discipline. Each additional font family and weight is another file the browser must fetch before text can settle into its final shape. Limit yourself to the families the design genuinely needs, and consider whether a fallback system font is acceptable for secondary text. The goal is a page that becomes readable quickly, without a flash of restyled text that shifts everything on screen.
Keep Layouts Stable and Interactions Responsive
Nothing erodes trust faster than a layout that jumps. Reserve space for images, embedded media, and advertising slots so content does not move when those elements arrive. Avoid inserting banners or notices above content that is already visible, and test pages on slower connections, where late-loading elements cause the worst shifts. A stable layout lets visitors read, tap, and click with confidence instead of guarding against surprises.
Responsiveness matters just as much. Heavy scripts, complex animations, and layers of interactive widgets can delay the moment a button or menu actually responds. Keep interactions simple, defer anything that is not needed for the first view, and test on a real phone rather than only on a fast office connection. For the foundations behind this work, review on-page SEO basics every designer should know, and for the way structure supports performance, read content structure that helps search rankings. Small, deliberate design choices compound into pages that feel fast, steady, and pleasant to use.