How Les Lunes increased its conversion rate by 16% with Speed Kit
Published on November 11, 2026
- Fashion
- Europe
- Shopify
+16.4%
Conversion rate uplift during the PoC phase
27%
Faster median LCP on accelerated pages
78%
Of next pages preloaded before the click
“The rollout at Les Lunes ran smoothly and needed hardly any time from our developers. Our customers get a noticeably faster shop, and we get the same proven setup as across the rest of the group.”
Introduction
Les Lunes is a women's fashion brand built around bamboo viscose, minimalist design and comfort, summed up in its claim "Look like Friday, feel like Sunday". Its leggings and jumpsuits are the best-known pieces. Les Lunes sells in nine countries and five languages from one Shopify store, has a community of more than 188,000 supporters and is part of the SNOCKS Group.
Challenge
When Les Lunes joined the SNOCKS Group, its international business ran on several separate Shopify stores, which the group brought together into one store with Shopify Markets. The same three developers look after every brand in the group, so a faster shop could not become a project of its own. The group wanted Les Lunes on the same setup as SNOCKS and a clean measurement of what it would bring.
Solution
Speed Kit runs on top of the existing Shopify store and its theme, without replatforming. The SNOCKS developers installed the Speed Kit app and enabled its app embed, and Speed Kit took care of the rest. During the PoC phase, 10% of visitors on leslunes.de got Speed Kit and the other 90% formed an unaccelerated control group. Speed Kit has since been rolled out to all visitors and to the international domains.
Results
Business Impact — PoC Phase: Conversion Rate Analysis: During the PoC phase, sessions with Speed Kit converted 16.4% more often than sessions in the control group, and the conversion rate per user rose by 17.6%. The Speed Kit group was ahead in every week of the test.
Performance Improvements — Largest Contentful Paint (LCP): Across all accelerated pages, the main content reaches the customer 27% faster at the median, about half a second sooner. Collection pages gained the most at 42%, product pages load 20% faster and the homepage 12%. Time to First Byte is 75% faster and First Contentful Paint 22%.
Predictive Preloading Coverage: 78% of next pages are cached before the users visit them, so most clicks in the store open a page that is already on the device.
Conclusion
Les Lunes wanted the same setup as the rest of the SNOCKS Group, without a separate project for a small development team. With Speed Kit, the conversion rate rose by 16.4% against an unaccelerated control group, main content loads 27% faster and 78% of next pages are ready before the click. Speed Kit is now live for all Les Lunes visitors.
