PageSpeed measurably affects user experience, conversion rate and Google rankings: 53% of mobile users leave pages that take longer than 3 seconds to load (Google/SOASTA). Since 2021, the Core Web Vitals have also been an official ranking factor. For online shops, performance is therefore usually not a nice-to-have but an economic foundation.
This question can be answered with data: 53% of mobile users leave a page that takes longer than 3 seconds to load (Google/SOASTA). Websites loading in 1 second also achieve roughly 5x higher conversion rates than pages with 10-second load times (Portent). Loading time is therefore not a purely technical detail – it directly affects visitor numbers and revenue. We explain how we speed up websites and shops on our PageSpeed optimisation page.
Then there is the search engine perspective: since 2021, the Core Web Vitals – Google's metrics for loading behaviour, interactivity and visual stability – have been an official ranking factor. A slow page therefore competes not only for visitors' patience but also for visibility in search results. Performance optimisation and search engine optimisation are closely intertwined.
What PageSpeed actually affects
- Conversion rate – the faster the page, the more visitors complete a purchase or enquiry
- Bounce rate – in our experience, long loading times lead to early abandonment
- Google rankings – Core Web Vitals have been an official ranking factor since 2021
- Google Ads – landing page experience feeds into the Quality Score and can influence click prices
- Crawling – fast pages can be indexed more efficiently by search engines
- Brand perception – a sluggish website appears less trustworthy to many users
Which values you should aim for
Google evaluates the Core Web Vitals against specific thresholds: the Largest Contentful Paint (LCP) should occur within 2.5 seconds, the interaction latency (INP) should stay below 200 milliseconds and the Cumulative Layout Shift (CLS) below 0.1. These thresholds apply to the majority of real page views – what is measured is the actual user experience, not just a lab value.
PageSpeed can be measured with freely available tools such as Google PageSpeed Insights or Lighthouse. The distinction between lab and field data matters here: lab data is generated under standardised test conditions and is well suited to pinpointing specific problems. Field data, by contrast, comes from real visitors with different devices and connections – it shows how your page is experienced in practice and forms the basis for Google's Core Web Vitals assessment. A good lab score is a start; what counts are the values of real users. It is also wise to repeat measurements regularly, as new plugins, additional scripts or growing product catalogues can gradually degrade loading times.
In our experience, the biggest levers lie in a few areas: optimised and correctly sized images, consistent caching, compressed delivery of HTML, CSS and JavaScript, lean code without unnecessary third-party scripts, and capable hosting with a current PHP version and HTTP/2. For shop systems, application-specific measures are added, such as database tuning and multi-level cache configuration.
A realistic perspective matters, though: PageSpeed is a significant factor, but not the only one. Content, structure and the technical quality of a page also play an essential role in rankings. A fast page with weak content will usually not succeed on loading time alone – conversely, a slow page cannot reach its potential. Our free shop check provides an objective assessment of where you stand.
The figures cited are based on research by Google/SOASTA and Portent. Such values are averages and can vary depending on industry, target group and time of measurement.