Free store speed test for any ecommerce platform

Google bands the score at 90 and above for good, 50 to 89 for needs work, and below 50 for poor. Those bands were set for websites in general, and ecommerce pages carry more weight than most, so aim for 70 on mobile rather than 90. For context, in our benchmark of 1,533 Shopify stores the median mobile score was 47, with industry medians running from 40 to 55, so 60 already clears the median of every industry we measured.

Three numbers Google measures on real Chrome visits: LCP, how long the main content takes to appear; INP, how quickly the page responds to a tap or click; and CLS, how much the layout moves around. Google uses them as one of many signals in search ranking. A page passes when each of the three is good for at least 3 in 4 visits.

That is mostly the test rather than your store: mobile runs on a throttled 4G connection with the CPU slowed down, desktop runs unthrottled. In our benchmark the median store scored 47 on mobile and 65 on desktop. The mobile lab test is also much harsher than real visits: only 1% of stores passed the 2.5-second LCP mark in it, against 91% on real mobile visits across the whole store. On desktop the gap was smaller, 68% in the lab against 94% for real visitors. Compare your mobile score to other mobile scores.

Third-party scripts, ahead of anything in your own theme. Across 1,533 Shopify stores, those loading 5 or fewer detected third-party services had a median mobile score of 74, while the most common band, 21 to 30 services, sat at 44. Oversized hero images come next. The third-party breakdown shows what individual services cost.

The test itself runs on any store, whatever it is built on, because it measures the page your visitors load. The fix steps are written for two platforms: Shopify, and WordPress, which covers WooCommerce. On BigCommerce, Ecwid or a custom build you get the same findings with generic steps. For a Shopify store, the Shopify speed test adds theme and app checks.

Read it against the same bands as any other store: above 70 on mobile is a good target. WooCommerce runs on WordPress, so the two things that usually hold the score down are your host and the plugins loading on every page. Caching and image conversion are the fixes that move it most, and the report names which ones apply to your store.

Load time decides whether shoppers stay. Portent's research found that ecommerce sites loading in 1 second convert at roughly 2.5x the rate of sites loading in 5 seconds, and a Deloitte and Google study measured an 8.4% lift in retail conversions from a 0.1-second improvement in mobile load time. Speed also feeds ranking, so a slow store loses traffic before it loses the sale.