[{"data":1,"prerenderedAt":159},["ShallowReactive",2],{"\u002Fcustomers\u002Fseidensticker":3,"\u002Fcustomers\u002Fseidensticker:related":143},{"id":4,"title":5,"author":6,"authorImage":6,"body":7,"customerName":113,"date":114,"description":115,"draft":116,"extension":117,"featured":116,"heroImage":118,"industry":119,"logo":120,"logoSize":121,"meta":122,"navigation":123,"path":124,"platform":125,"quote":126,"quoteAuthor":127,"readTime":6,"region":128,"results":129,"seo":139,"stem":141,"__hash__":142},"customers\u002Fcustomers\u002Fseidensticker.md","How Seidensticker increased conversions by +2.86% with Speed Kit",null,{"type":8,"value":9,"toc":104},"minimark",[10,15,19,22,25,29,32,36,39,42,46,49,56,59,65,88,91,95,98,101],[11,12,14],"h2",{"id":13},"introduction","Introduction",[16,17,18],"p",{},"Seidensticker is a long-established German fashion brand that has stood for high-quality shirts, blouses, and apparel for generations. Through its own online shop, seidensticker.com, the company reaches thousands of customers every day who navigate an extensive product range across numerous category and product pages.",[16,20,21],{},"For a fashion shop of this size, the speed of the category pages is decisive: this is where customers decide whether to browse the range or bounce. Slow load times on image-heavy overview pages translate directly into friction in the purchase journey.",[16,23,24],{},"To meet these expectations, Seidensticker adopted Speed Kit — with the goal of accelerating page delivery and making the shopping experience noticeably smoother, without any changes to the existing tech stack.",[11,26,28],{"id":27},"challenge","Challenge",[16,30,31],{},"With a growing product range and a high share of image-heavy category pages, Seidensticker set out to noticeably improve the load times of these central navigation surfaces — without changes to the existing shop architecture and without additional development effort.",[11,33,35],{"id":34},"solution","Solution",[16,37,38],{},"Speed Kit was integrated as a lightweight optimization layer — with no changes to the existing shop architecture. Its core mechanism, predictive preloading, anticipates the pages users are most likely to visit next and silently preloads them in the background. A large share of subsequent pages is therefore served straight from cache or fully pre-rendered in the background.",[16,40,41],{},"The result is a markedly faster browsing experience — particularly when moving between category and product pages, where speed determines dwell time and conversion.",[11,43,45],{"id":44},"results","Results",[16,47,48],{},"During the Proof of Concept (March 18 – April 14, 2026), Speed Kit delivered substantial LCP improvements — strongest on the category pages, the shop's central navigation surfaces.",[16,50,51],{},[52,53],"img",{"alt":54,"src":55},"LCP improvements on Seidensticker category pages","\u002Fimages\u002Fcustomers\u002Fseidensticker\u002F1.webp",[16,57,58],{},"Speed Kit was deployed in a controlled 50\u002F50 A\u002FB test over four weeks: a Speed Kit-accelerated group was compared directly against an unaccelerated control group.",[16,60,61],{},[52,62],{"alt":63,"src":64},"Conversion rate analysis for Seidensticker","\u002Fimages\u002Fcustomers\u002Fseidensticker\u002F2.webp",[66,67,68,76,82],"ul",{},[69,70,71,75],"li",{},[72,73,74],"strong",{},"User conversion rate:"," +2.86% (relative)",[69,77,78,81],{},[72,79,80],{},"Transactions \u002F orders:"," +3.05% (relative)",[69,83,84,87],{},[72,85,86],{},"Revenue:"," +2.66% (relative, between groups)",[16,89,90],{},"Statistical significance: The +2.86% relative uplift in user conversion rate is statistically significant at a 90% confidence level (p ≈ 7.74%), based on a four-week 50\u002F50 A\u002FB test. The improvement is not attributable to random variation.",[11,92,94],{"id":93},"conclusion","Conclusion",[16,96,97],{},"For Seidensticker, performance feeds directly into the bottom line. By accelerating Largest Contentful Paint on the decisive category pages by 359 ms (~39%) and preloading a large share of subsequent pages, browsing through the range becomes noticeably smoother.",[16,99,100],{},"The commercial impact is clearly proven in the controlled A\u002FB test: a +2.86% relative uplift in user conversion rate and a +2.66% relative revenue uplift versus the control group — statistically significant at a 90% confidence level.",[16,102,103],{},"Speed Kit is now a permanent part of Seidensticker's performance stack, ensuring every visitor benefits from a faster, seamless shopping experience.",{"title":105,"searchDepth":106,"depth":106,"links":107},"",2,[108,109,110,111,112],{"id":13,"depth":106,"text":14},{"id":27,"depth":106,"text":28},{"id":34,"depth":106,"text":35},{"id":44,"depth":106,"text":45},{"id":93,"depth":106,"text":94},"Seidensticker","June 9, 2026","Seidensticker is a long-established German fashion brand known for high-quality shirts, blouses, and apparel, served through seidensticker.com.",false,"md","https:\u002F\u002Fimages.unsplash.com\u002Fphoto-1595828201560-11d36b6828a8","Fashion","\u002Fimages\u002Fcustomer-logos\u002FLogo-White-Seidensticker.svg",1,{},true,"\u002Fcustomers\u002Fseidensticker","Shopware","Speed isn't a technical detail for our shop — it's part of the brand experience. Speed Kit made our category pages noticeably faster, and the A\u002FB test proves in black and white that this translates directly into more conversions and revenue. The integration was seamless, with no changes to our existing stack.","Katharina Harig, Teamlead E-Commerce, Seidensticker","Europe",[130,133,136],{"metric":131,"value":132},"Relative uplift in user conversion rate","+2.86%",{"metric":134,"value":135},"LCP improvement on category pages","−359 ms",{"metric":137,"value":138},"Relative revenue uplift between test groups","+2.66%",{"title":140,"description":115},"Seidensticker Case Study | Speed Kit","customers\u002Fseidensticker","RambsKVz4Fog6--KaWLDQskTXSimiZp4QBF8sCTyiNA",[144,149,154],{"path":145,"customerName":146,"industry":119,"heroImage":147,"logo":148,"logoSize":121},"\u002Fcustomers\u002Fawg-mode","AWG Mode","https:\u002F\u002Fimages.unsplash.com\u002Fphoto-1746527971817-65b072ccc436","\u002Fimages\u002Fcustomer-logos\u002FLogo-White-AWG-Mode.png",{"path":150,"customerName":151,"industry":119,"heroImage":152,"logo":153,"logoSize":121},"\u002Fcustomers\u002Fcarhartt-wip","Carhartt WIP","https:\u002F\u002Fimages.unsplash.com\u002Fphoto-1593489463499-e1b3b7b8bcce","\u002Fimages\u002Fcustomer-logos\u002FLogo-White-Carhartt-WIP.png",{"path":155,"customerName":156,"industry":119,"heroImage":157,"logo":158,"logoSize":121},"\u002Fcustomers\u002Fpurelei","Purelei","https:\u002F\u002Fimages.unsplash.com\u002Fphoto-1633934542430-0905ccb5f050","\u002Fimages\u002Fcustomer-logos\u002FLogo-White-Purelei.png",1787917380317]