---
title: "Your store is fast. On your phone | Proof of Pixel"
description: "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."
url: https://proofofpixel.agency/guides/checkout
author: "Proof of Pixel"
modified: 2026-10-19
---

# 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](https://proofofpixel.agency/blog/site-speed-revenue)

## Compare

-   [Shopify vs WooCommerce](https://proofofpixel.agency/compare/shopify-vs-woocommerce) Plan prices, card fees in four markets, field speed data, tracking and what moving between them takes.

Proof of Pixel: marketing and consulting agency. Dubai, New York, London, Antwerp, Kuala Lumpur. [business@proofofpixel.agency](mailto:business@proofofpixel.agency)

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