How Grube increased conversions by +4.9% with Speed Kit
Published on October 30, 2026
- DIY, Tools & Repair
- Europe
- Custom
+4.9%
Conversion rate uplift from faster page loads
52%
Faster median LCP on accelerated pages
81%
Faster Time to First Byte
“With customer-specific pricing across several shops, performance was a constant challenge for us. Speed Kit has cut our load times by about half, and by even more on product pages.”
Introduction
Grube started in 1945 as a family business in the Lüneburg Heath and is run by the third generation today. Its range covers forestry, hunting, arboriculture and outdoor, with well over 30,000 products. The Grube group has 11 branches in 10 European countries and runs several online shops on one technical platform.
Challenge
Grube knew its shop was not among the fastest, and page speed was a topic that kept coming back. Much of it comes from the business itself. Many customers are companies and public authorities with their own negotiated prices, and that pricing logic made pages slower to load. Shop development runs through an external agency.
Solution
Speed Kit was added to Grube's shops with a quick integration and no rebuild of the shop itself. It works out which page a visitor is likely to open next and prepares it in the background, so that page is often ready before the click. During the PoC phase, half of the visitors got Speed Kit and the other half stayed in an unaccelerated control group. The results convinced Grube to keep working with Speed Kit.
Results
Speed Directly Drives Commercial Results: Speed Kit's impact charts group real sessions on the shop by how fast their pages loaded. On Grube, every 100 ms of faster Largest Contentful Paint goes with a 1.1% higher conversion rate, a 1.8% higher add-to-cart rate and 2.3% longer sessions. With the acceleration Speed Kit delivered, that comes to a 4.9% higher conversion rate, an 8.2% higher add-to-cart rate and 10.1% longer sessions.
Performance Improvements — Largest Contentful Paint (LCP): For the Speed Kit group, the main content on accelerated pages appeared 52% faster at the median, and the first byte arrived 81% sooner. Product pages gained the most at 59%, category pages 54%.
Conclusion
Grube wanted a faster shop despite its complex customer pricing. With Speed Kit, main content loads 52% faster on accelerated pages, the first byte arrives 81% sooner, and faster pages lift the conversion rate by 4.9%. On that basis, Grube decided to work with Speed Kit.
