Design performance

  • Write the whole page design in CSS (no images) if at all possible
  • Mobile-first (with no images at all)
  • Design the page so all all images could be lazy-loaded without the page looking stupid
  • Obviously don’t include unnecessary elements in the page


  • Lazy-load all images, depending on visibility
  • Serve all files yourself - then you can bundle them up into a single request
  • Use sprites wherever possible
  • Try to have one request for all JS, and one for all CSS.