Calibre for Ecommerce
Keep every shopper’s journey fast
Monitor speed and Core Web Vitals across your whole store. See how product pages, search and checkout perform for real shoppers, and find what is slowing them down.
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Built for online stores
Measure product, category and checkout pages as groups
Real User Monitoring on every page, including accounts and checkout
Core Web Vitals for every important page, not just the home page
Break down real visits by country, city, device model and browser
See which visits are instant thanks to the back/forward cache or prerendering
Real-user data within minutes of a release
Measure what each third-party tag costs
Catch slow releases before they reach shoppers
“Thanks to Calibre’s reporting, we were able to detect a massive downgrade in performance.”
Journeys
Measure the pages that make money
Shopify found that for every 100 milliseconds slower a store loads, conversion tends to be about 3.5% lower. See where your shoppers are waiting, page by page.
Page groupings for every page type
Group URLs with patterns like /products/* or each checkout step, then compare sessions, UX Rating and Core Web Vitals for each part of the store.
Learn about page groupings →
Every important page, not just the home page
Calibre scans your store, finds its most important pages and tracks Google CrUX data for each one, with nothing to install. See which product and category pages fail Core Web Vitals.
Learn about CrUX Pages →Diagnose
Find what is slowing shoppers down
Go from a slow metric to the cause, with data from real visits.
The elements behind slow interactions
Interaction to Next Paint attribution shows which buttons, filters and menus are slow to respond for real shoppers.
Learn about RUM metric detail →
Where shoppers have slow experiences
See the share of good, needs improvement and poor experiences by country, device and browser, then filter to a city or device model, so you know which markets need attention first.
Learn about the Audience report →Protect
Know what tags and releases cost
Marketing tags and new features both add weight. Measure each one before it costs you sales.
The cost of every third party
See the transfer size and execution time of each analytics, chat, reviews or advertising script. Block a provider in a test to measure the difference without it.
Learn about the Third Party report →
Before and after every release
Set performance budgets with alerts by email or Slack and test pull requests before they merge. After a fix goes live, see whether it helped real shoppers, deploy by deploy.
Learn about deploy tracking →Questions from online stores
How is Calibre different from PageSpeed Insights for an online store?
PageSpeed Insights is a great way to check a single URL, and shows Google CrUX data for that URL or your whole origin. Calibre scans your store to find its most important pages and tracks CrUX data for each one, then adds Real User Monitoring and scheduled synthetic Lighthouse tests. You see every product, category and checkout page, not one URL at a time.
Can Calibre monitor checkout and logged-in account pages?
Yes. Real User Monitoring measures any page that loads the Calibre snippet, including checkout and account pages. Synthetic tests can log in with single or multi-step forms, basic authentication, or custom cookies and headers. Two-factor authentication is not supported for synthetic tests.
How do I measure a page type, like all product pages?
Create page groupings with URL patterns, such as /products/* or each checkout step. Compare groupings in the RUM Pages, metric and Audience reports, or filter any RUM report to a single grouping.
How do I find out what third-party tags cost?
Every synthetic test includes a Third Party report with the transfer size and execution time of each external service. Block a provider in a Test Profile to measure the difference with and without it.
How do I stop a release from slowing the store down?
Set performance budgets on the metrics that matter and get alerts by email, Slack or webhook. Pull request reviews test preview deployments before they merge, and deploy markers show how each release changed performance for real shoppers.
How quickly does real-user data arrive?
Real User Monitoring data appears within minutes, and the RUM Dashboard shows live visitors from the last 15 minutes, so you can see the effect of a release the same day. Google CrUX data is a rolling 28-day view, which Calibre tracks alongside it for the long-term trend.
Can I see how shoppers navigate between pages?
Yes. Filter Real User Monitoring by navigation type to compare standard loads, reloads, back and forward visits, back/forward cache restores, prerendered pages and soft navigations in single-page apps. It shows whether the back button to a category page is instant, and whether prerendering is paying off.
Does Calibre work with my store platform?
Calibre is not tied to a platform. Google CrUX data and synthetic tests need nothing installed, and Real User Monitoring works on any store where you can add a script to the page head.
Do I need to install anything?
Google CrUX data and synthetic tests need nothing installed on your store. Real User Monitoring needs the Calibre snippet in the head of each page you want to measure, and you can set a sampling rate.
Need help to dial in your new speed system?
Our friendly, knowledgeable team will help you establish a system that works efficiently or answer any questions. We’re here to support you in your web performance journey. Contact support.
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