Payment and gateway timeouts
Checkout often waits on third parties. Under concurrency those waits stack. The network log shows which call held the session.
Use case · Checkout
Checkout performance testing for when everyone buys at once.
Make checkout hold. It is where peak revenue concentrates and where slow pages hurt most. Evaluat rehearses your real cart and payment journey in many concurrent real browsers, then shows the sessions that dragged.
Performance Testing is available through assisted private access.
What usually breaks
Checkout failure modes we look for.
Shipping and tax calculators
Dynamic quotes that look fine for one shopper can queue when many carts calculate at once.
Login and account steps
Returning-customer paths share auth and session services. Failures here look like “the site is down” to buyers.
Apps and tags on the funnel
Upsells, reviews, and tracking pixels on cart and checkout pages can dominate INP and LCP under load.
How a rehearsal works
Three steps. No scripts required.
Agree the journey
Home or PDP into cart, shipping, payment, and thank-you. You build it in the visual step editor, including popup and cookie handling.
Agree the target and bounds
Staging or production, region (UK or EU), concurrency shaped to your forecast peak, and anything we must not hit.
Run and read the evidence
Every virtual user is a real browser. Open the sessions that slowed. Watch the video. Find the request, script, or step that held the line.
Platform notes: Magento load testing, Shopify under load, WooCommerce.
Questions
FAQ
What is checkout performance testing?
It is a real-browser rehearsal of cart, shipping, payment, and confirmation steps at the concurrency you expect when many shoppers check out together. The goal is to find where the journey slows or fails before a sale does.
Will you hit our live payment provider?
We agree the exact target before any traffic goes out. Prefer a staging checkout or a payment sandbox when available. Production runs stay small and bounded unless you explicitly ask for more.
What do we get back?
Session video, network logs, and console output for every virtual user, so your team can see the step that broke. You can generate an Executive Summary with a plain-language verdict on top.
Is this available now?
Performance Testing is available through assisted private access.