# Speed Kit

> The #1 website acceleration software for ecommerce brands. Speed Kit uses a service worker and dynamic edge caching to make storefronts load instantly, improving Core Web Vitals, SEO, and conversion.

## Key pages
- [Home](https://www.speedkit.com/): Product overview
- [Pricing](https://www.speedkit.com/pricing): Sales-led pricing
- [Book a demo](https://www.speedkit.com/demo): Request a personalized demo

## Documentation
- [A/B Testing](https://www.speedkit.com/docs/ab-testing): How Speed Kit resolves the conflict between A/B testing and web performance through flicker-free integrations, caching strategies, and best practices.
- [Akamai Bot Manager](https://www.speedkit.com/docs/akamai-bot-manager): How to verify Akamai Bot Manager compatibility with Speed Kit and manually configure Speed Kit as a custom bot when strict security policies require it.
- [Business Impact](https://www.speedkit.com/docs/business-impact): How Speed Kit drives e-commerce success by boosting conversions, traffic, engagement, and customer lifetime value while lowering acquisition costs.
- [Client-Side Rendering](https://www.speedkit.com/docs/client-side-rendering): How Speed Kit adds a server-side rendering layer to make client-side rendered pages cacheable, delivering instant LCP without sacrificing interactivity.
- [Configuration](https://www.speedkit.com/docs/configuration): A developer reference for the Speed Kit configuration object, covering basic properties, the rule-based matcher system, and advanced options like image optimization and query-parameter stripping.
- [Content Delivery Networks (CDN)](https://www.speedkit.com/docs/content-delivery-networks): How Speed Kit complements any CDN by accelerating the dynamic, personalized HTML that CDNs cannot cache, forming a complete two-pillar performance architecture.
- [Data Compliance](https://www.speedkit.com/docs/data-compliance): An overview of Speed Kit's GDPR compliance, data processing, cookie consent classification, privacy-preserving AI, and verified security measures.
- [Debugging Speed Kit](https://www.speedkit.com/docs/debugging-speed-kit): A complete guide to testing and debugging a Speed Kit integration using the browser extension, dashboard, URL parameters, bookmarklet, developer tools, and WebPageTest.
- [Dynamic Caching](https://www.speedkit.com/docs/dynamic-caching): How Speed Kit makes uncacheable HTML cacheable, merges dynamic content in the browser, and keeps all cache layers synchronized with your origin.
- [Emergency Action Plan](https://www.speedkit.com/docs/emergency-action-plan): The emergency protocol for deactivating Speed Kit for all users and reporting an issue if you suspect Speed Kit is causing a problem on your website.
- [How Speed Kit Works](https://www.speedkit.com/docs/how-speed-kit-works): A technical overview of how Speed Kit eliminates server, network, and browser time through dynamic caching, a service worker, and predictive preloading.
- [Image Optimization](https://www.speedkit.com/docs/image-optimization): How Speed Kit automatically transcodes, resizes, and compresses images at the edge—without client-side JavaScript—to shrink file sizes and improve LCP.
- [Installation Guide](https://www.speedkit.com/docs/installation-guide): A step-by-step guide to integrating Speed Kit, from the kickoff meeting through technical setup, QA, and go-live.
- [Measuring Web Performance](https://www.speedkit.com/docs/measuring-web-performance): A guide to lab vs. field data, Core Web Vitals, and using RUM to connect performance metrics to business KPIs in e-commerce.
- [Predictive Preloading](https://www.speedkit.com/docs/predictive-preloading): How Speed Kit predicts, pre-caches, and pre-renders the next page to deliver instant e-commerce navigation without overloading your origin.
- [Real-User Monitoring](https://www.speedkit.com/docs/real-user-monitoring): How Speed Kit's RUM captures authentic user performance data, ties it to business outcomes, and fuels the predictive preloading engine.
- [Refresh API](https://www.speedkit.com/docs/refresh-api): A REST API for triggering and monitoring cache refresh jobs across your Speed Kit assets, with filtering, refresh modes, tagging, and status queries.
- [Reliability & Support](https://www.speedkit.com/docs/reliability-and-support): How Speed Kit's redundant infrastructure, automatic fail-safes, manual controls, and expert support team ensure uninterrupted website availability.
- [SEO Impact](https://www.speedkit.com/docs/seo-impact): How Speed Kit improves Core Web Vitals and user experience to boost search rankings, with proof methodology and safe crawler compatibility.
- [Shop Migration](https://www.speedkit.com/docs/shop-migration): How to protect web performance during an e-commerce platform migration with Speed Kit's data-driven planning and 3-phase support program.
- [Single-Page Applications](https://www.speedkit.com/docs/single-page-applications): How Speed Kit accelerates Single-Page Applications by optimizing soft navigations, caching API calls, and accurately measuring SPA performance.
- [Speed Improvements & Metrics](https://www.speedkit.com/docs/speed-improvements-and-metrics): How Speed Kit reduces backend, network, and browser time to improve TTFB, FCP, LCP, and the other Core Web Vitals.
- [Speed Kit Bot](https://www.speedkit.com/docs/speed-kit-bot): Details on the Speed Kit Bot's cookie-less, anonymous fetches, its User-Agent identifier, and where to retrieve its current egress IP addresses.
- [Speed Kit on Shopify](https://www.speedkit.com/docs/speed-kit-on-shopify): How Speed Kit issues and renews the Shopify Crawler Access Signature automatically, and which Shopify-specific behaviors it applies.
- [Speed Kit vs Native PPR](https://www.speedkit.com/docs/speed-kit-vs-native-ppr): Why Speed Kit's decoupled, browser-native approach delivers the instant loading of Next.js Partial Prerendering without the refactoring, cost, and maintenance burden.
- [Third-Party Acceleration](https://www.speedkit.com/docs/third-party-acceleration): How Speed Kit routes third-party assets through a single optimized HTTP/3 connection and caches them to boost performance and resilience against provider outages.
- [Website Changes](https://www.speedkit.com/docs/website-changes): Website modifications such as A/B tests, architecture shifts, and URL changes that require reviewing and adjusting your Speed Kit configuration.
- [Webviews](https://www.speedkit.com/docs/webviews): Why Speed Kit does not accelerate mobile app webviews by default, and the steps a customer's development team must take to enable acceleration.

## Blog
- [A page speed A/B test: How it’s done right](https://www.speedkit.com/blog/a-page-speed-a-b-test-how-its-done-right): This article covers the basics of how to conduct a proper A/B test to examine if a change in the website infrastructure had a positive impact on the web performance.
- [A practical guide to A/B testing with multiple comparisons](https://www.speedkit.com/blog/a-practical-guide-to-a-b-testing-with-multiple-comparisons): In this article, we will explain the fundamentals of A/B testing and focus on how to conduct A/B tests with more than two groups.
- [Common causes of layout shifts and how to fix them for better CLS](https://www.speedkit.com/blog/common-causes-of-layout-shifts-and-how-to-fix-them-for-better-cls): This article is about four of the most common causes for layout shifts, how to fix them, and about how to measure and monitor cumulative layout shifts.
- [Don’t Settle for “Good”: It Is Time for New LCP Thresholds](https://www.speedkit.com/blog/dont-settle-for-good-it-is-time-for-new-lcp-thresholds): We at Speed Kit are now extending Google's LCP thresholds in all our dashboards by adding two additional buckets to show more details for page loads faster than 2.5s.
- [Enhancing web responsiveness: How to debug and avoid slow interactions](https://www.speedkit.com/blog/enhancing-web-responsiveness-how-to-debug-and-avoid-slow-interactions): Web responsiveness is the measure of how quickly a website responds to user interactions, and it is crucial for providing a smooth and efficient user experience to your users.
- [Field Testing CSS Containment for Web Performance Optimization](https://www.speedkit.com/blog/field-testing-css-containment-for-web-performance-optimization): CSS Containment can help reduce the amount of rendering work the browser does when initially loading a page. But just how much can it improve performance?
- [Fundamentals of page speed monitoring](https://www.speedkit.com/blog/fundamentals-of-page-speed-monitoring): This article explains the most important page speed KPIs and measurements and discusses different tools and methods to monitor page speed.
- [Measuring Largest Contentful Paint in Single-Page Applications](https://www.speedkit.com/blog/measuring-largest-contentful-paint-in-single-page-applications): In this article, we will explain how to measure the Largest Contentful Paint (LCP) in Single-Page Applications (SPA).
- [Predictive Preloads: Stop Reacting to Clicks and Start Predicting Them](https://www.speedkit.com/blog/predictive-preloads-stop-reacting-to-clicks-and-start-predicting-them): While many website owners focus on achieving 'good' scores on metrics like Core Web Vitals, savvy e-commerce leaders understood long ago that this is merely the baseline.
- [Reducing layout shift with custom fallback fonts](https://www.speedkit.com/blog/reducing-layout-shift-with-custom-fallback-fonts): You go to a website and start reading the text as soon as it appears. But then the web font loads and the rest of the content shifts.
- [Speed Kit 2025: The Shift From Optimization to Prediction](https://www.speedkit.com/blog/speed-kit-2025-the-shift-from-optimization-to-prediction): For the last decade, web performance has been a game of marginal gains. Developers have fought for every millisecond, optimizing distinct requests and shaving bytes off payloads.
- [Speed Kit: Making websites faster with service workers and dynamic caching](https://www.speedkit.com/blog/speed-kit-making-websites-faster-with-service-workers-and-dynamic-caching): In this blog article, we explain how the unique service worker technology of Speed Kit enables dynamic caching and enhances the website speed and Core Web Vitals of our customers.
- [Unload beacon reliability: Benchmarking strategies for minimal data loss](https://www.speedkit.com/blog/unload-beacon-reliability-benchmarking-strategies-for-minimal-data-loss): Unload beacons are vital for real-user monitoring as they send final data when a user leaves a web page. The most reliable method combines visibilitychange and pagehide events, achieving a reliability…
- [What is the Time to First Byte (TTFB) and how to improve it](https://www.speedkit.com/blog/what-is-the-time-to-first-byte-and-how-to-improve-it): What is the TTFB? What Business impact does it have? How can I measure it? And How can I reduce it? Those are the questions answered in this blog.
- [Why Google’s CrUX results are not reproducible with your real-user monitoring](https://www.speedkit.com/blog/why-googles-crux-results-are-not-reproducible-with-your-real-user-monitoring): In this post, we’ll give a detailed explanation of why CrUX and RUM often report contradicting performance measurements and why you should still keep an eye on both.
- [Why Interaction to Next Paint (INP) matters to your business](https://www.speedkit.com/blog/why-interaction-to-next-paint-inp-matters-to-your-business): In today's fast-paced digital world, users have high expectations when it comes to website performance. Slow loading times and unresponsive interfaces can lead to frustration and drive visitors away.
- [Why Largest Contentful Paint (LCP) matters for your business](https://www.speedkit.com/blog/why-largest-contentful-paint-lcp-matters-for-your-business): In this article, we will explore the impact of the Largest Contentful Paint (LCP) on your business and how you can optimize it to enhance user satisfaction and achieve better business outcomes.

## Customer Case Studies
- [How AWG increased conversions by +4.23% with Speed Kit](https://www.speedkit.com/customers/awg-mode): AWG is a well-established German fashion retailer combining affordability with quality across a wide range of clothing for the entire family, served through awg-mode.de.
- [How BMW creates instant online experiences with Speed Kit's predictive preloads](https://www.speedkit.com/customers/bmw): BMW is one of the largest premium car manufacturers globally, delivering a superb web experience across 118 countries with Speed Kit's predictive preloads.
- [How canyon.com increased orders by +1.66% with Speed Kit](https://www.speedkit.com/customers/canyon): Canyon is a global leader in the cycling industry, known for engineering high-performance bikes for enthusiasts and professionals alike.
- [How the Carhartt Work in Progress website loads 1.9x faster with Speed Kit](https://www.speedkit.com/customers/carhartt-wip): Carhartt Work in Progress (WIP) is a licensee of the Carhartt workwear brand, offering street wear styles to subcultures like skating, graffiti, hip hop, and BMX across Europe and beyond.
- [How the Condor website loads faster with Speed Kit](https://www.speedkit.com/customers/condor): Condor, a leading airline based in Germany, is renowned for its commitment to providing exceptional travel experiences across the globe.
- [How design-bestseller.de loads faster with Speed Kit](https://www.speedkit.com/customers/design-bestseller): design-bestseller.de is a leading online retailer for designer furniture, offering design classics from brands such as Vitra, USM Haller, Knoll International, and Hay.
- [How DICTUM increased conversions by 6.96% with Speed Kit](https://www.speedkit.com/customers/dictum): DICTUM is one of Europe's most respected specialist retailers for high-quality hand tools, materials, and knives, serving professionals and passionate craftspeople since 1848.
- [How Erwin Müller increased conversions by +1.74% with Speed Kit](https://www.speedkit.com/customers/erwin-muller): Erwin Müller is one of Germany's most established home and lifestyle retailers, offering textiles, bedding, bath products, tableware, and home decor through de.erwinmueller.com.
- [How Hawesko generates +3.26% more revenue with Speed Kit](https://www.speedkit.com/customers/hawesko): Hawesko is one of Germany's leading premium wine retailers, recognised for its curated selection of fine wines, champagnes and spirits, served through hawesko.de.
- [How HOLY made one of Germany's largest Shopify shops 47% faster with Speed Kit](https://www.speedkit.com/customers/holy): HOLY is one of Germany's fastest-growing beverage brands and runs one of the country's largest Shopify shops. With Speed Kit, collection and product pages now render in a fraction of the previous time — with a statistically significant effect on conversion rate.
- [How Hugendubel makes +4.37% more revenue with Speed Kit](https://www.speedkit.com/customers/hugendubel): Hugendubel, one of Germany's leading book retailers, has made its e-commerce business a central pillar of its growth strategy across hugendubel.de and ebook.de.
- [How Jacques' Wein-Depot made its Angular shop 34% faster with Speed Kit](https://www.speedkit.com/customers/jacques-wein-depot): Jacques' Wein-Depot is Germany's best-known specialist for French wine, combining a nationwide network of depots with the online shop jacques.de. With Speed Kit, its Angular single-page application delivers product and listing pages in a fraction of the previous time — with a measurable effect on conversion rate and revenue.
- [How Kastner & Öhler increased conversions by +3.47% with Speed Kit](https://www.speedkit.com/customers/kastner-oehler): Kastner & Öhler, one of Austria's leading fashion retailers, accelerated its online shops with Speed Kit. Main content now loads 49% faster on the accelerated pages in Austria, and during the PoC phase the user conversion rate in the German shop rose by 3.47% relative to the control group.
- [How MeinAuto.de increased conversions by +3.66% with Speed Kit](https://www.speedkit.com/customers/meinauto-de): MeinAuto.de is a leading German online platform for buying and configuring new and premium vehicles, with its e-commerce site at the center of the customer experience.
- [How Morplan increased conversions by +5.72% with Speed Kit](https://www.speedkit.com/customers/morplan): Morplan is the UK's leading supplier of retail display, merchandising, and store equipment, trusted by independent boutiques, department stores, and global fashion brands.
- [How NICHE-BEAUTY increased conversions by +7.76% with Speed Kit](https://www.speedkit.com/customers/niche-beauty): Niche-Beauty.com is a leading European retailer for luxury niche fragrances and exclusive high-end beauty brands, with e-commerce at the heart of its premium experience.
- [How Parfumdreams increased conversions by +3.22% with Speed Kit](https://www.speedkit.com/customers/parfumdreams): Parfumdreams is a premier European retailer in the beauty and fragrance sector, with its e-commerce platform a vital cornerstone of its international expansion.
- [How Purelei increased conversions by +2.3% with Speed Kit](https://www.speedkit.com/customers/purelei): Purelei is a fast-growing German jewelry and lifestyle brand, celebrated for its Hawaii-inspired aesthetics and a fully digital-first retail model.
- [How RidersDeal lifted its conversion rate by +2.33% with Speed Kit](https://www.speedkit.com/customers/ridersdeal): RidersDeal is one of Europe's leading equestrian retailers, offering riding apparel, horse equipment and stable essentials through its Magento 2 shop ridersdeal.com.
- [How Santoni increased its conversion rate by 20% with Speed Kit](https://www.speedkit.com/customers/santoni): Santoni, the Italian maker of handmade luxury shoes since 1975, accelerated its Salesforce Commerce Cloud store with Speed Kit. During the PoC phase the Speed Kit group converted at a 20% higher rate than the control group and added products to the cart 14% more often, with main content loading 31% faster on accelerated pages.
- [How Seidensticker increased conversions by +2.86% with Speed Kit](https://www.speedkit.com/customers/seidensticker): Seidensticker is a long-established German fashion brand known for high-quality shirts, blouses, and apparel, served through seidensticker.com.
- [How the Snocks website loads 53% faster with Speed Kit](https://www.speedkit.com/customers/snocks): Snocks is a dynamic brand specializing in high-quality, comfortable everyday essentials — premium socks, underwear, and loungewear that blend modern design with comfort.
- [How Tamaris makes +2% more revenue with Speed Kit](https://www.speedkit.com/customers/tamaris): Tamaris is a renowned German footwear and accessories brand with a rich heritage dating back to 1919, and a subsidiary of the Wortmann Group.
- [How tectake grew online revenue by +8.93% with Speed Kit](https://www.speedkit.com/customers/tectake): tectake is a European online retailer for home, garden and living products, known for a broad, value-driven assortment. Running on Magento, www.tectake.de now delivers its category and product pages faster with Speed Kit - and during the PoC phase this translated into a measurable uplift in conversion rate, average order value and online revenue.
- [How titus.de & titus-shop.com load 31% faster with Speed Kit's predictive pre-rendering](https://www.speedkit.com/customers/titus): TITUS is Germany's leading retailer for skateboarding gear, streetwear, and accessories, at the forefront of the European skateboarding scene since 1978.
- [How Tom Tailor accelerates their SPA website with Speed Kit](https://www.speedkit.com/customers/tom-tailor): Tom Tailor is a leading international fashion brand offering high-quality, stylish clothing for men, women, and children, built on a SCAYLE, React, and Next.js stack.
- [How the TUI Cruises Mein Schiff website loads faster with Speed Kit](https://www.speedkit.com/customers/tui-cruises-mein-schiff): TUI Cruises Mein Schiff is one of Germany's leading cruise line operators, known for its premium voyages and world-class experiences.
- [How VAN GRAAF improved conversions by +7.53% with Speed Kit](https://www.speedkit.com/customers/van-graaf): VAN GRAAF is an internationally recognized fashion retailer, known for a wide selection of premium brands and high-quality customer service both in-store and online.
- [How VBS Hobby made its online shop 67% faster with Speed Kit](https://www.speedkit.com/customers/vbs-hobby): VBS Hobby, one of Europe's largest specialist mail-order suppliers for craft and hobby materials, accelerated www.vbs-hobby.com with Speed Kit. Main content now loads 67% faster, 81% of next pages are preloaded before the click, and during the PoC phase the user conversion rate rose by 2.59% relative to the control group.
- [How Zizzi increased conversions by +3.66% with Speed Kit](https://www.speedkit.com/customers/zizzi): Zizzi is a modern Scandinavian fashion retailer known for stylish plus-size collections and contemporary apparel, with e-commerce at the center of its customer experience.
- [How Zwilling makes +5% more revenue with Speed Kit](https://www.speedkit.com/customers/zwilling): ZWILLING J. A. Henckels AG is one of the largest and oldest manufacturers of kitchen knives, with a long-standing tradition of superb quality made in Germany.

## Features
- [Predictive Preloading](https://www.speedkit.com/feature/predictive-preloading): Speed Kit predicts the shopper's next move and preloads pages so navigation feels instant.