Cover of the Your store is fast. On your phone. field guide

Your store is fast. On your phone.

Your phone cached the store and runs on office wifi. The buyer is on a mid-range phone, on 4G, with a chat bubble over the card field. These twelve checks are what we run on a checkout before touching an ad account.

  • 2.5 s Largest Contentful Paint to pass Core Web Vitals (Google)
  • 200 ms Interaction to Next Paint, so taps respond (Google)
  • 75th pct Graded on real visits, so the slowest quarter decides (Google Search Console)

What is inside: 12 steps in 4 pages

  1. Test on a real phone on 4G. Not desktop, not the office wifi.
  2. Show the total early. Shipping and tax before checkout, not on the last step.
  3. Allow guest checkout. Account creation after the purchase, not before.
  4. Wallets on top.
  5. Autocomplete that works.
  6. 16px inputs.
  7. The right keyboard.
  8. Nothing over the form.
  9. Cut checkout scripts.
  10. Size every image.
  11. Inline errors.
  12. One purchase event.

Go deeper: Site speed and conversion: what actually matters