How the Weltbild website loads 1.2x faster with Speed Kit

Published on
May 15, 2023
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Weltbild GmbH & Co. KG, a prominent online retailer in Germany, specializes in books, gifts, and decorations. As a key part of the Weltbild D2C Group, which operates more than 15 online shops, Weltbild has always recognized the crucial role of page speed in enhancing the performance of their digital storefronts. With a growing emphasis on delivering an exceptional user experience, Weltbild continually seeks opportunities to optimize their website's page speed.

"The implementation process was seamless, and the Speed Kit team provided exceptional support throughout. Our website's performance has significantly improved, providing our customers with a faster and smoother online shopping experience."

Ralph Zeumann, Head of Software Development
Faster website
Improved TTFB
Happy users



Weltbild GmbH & Co. KG integrated Speed Kit into their website Utilizing cutting-edge caching algorithms and Service Worker technology, Speed Kit has amongst others enhanced the Time to First Byte (TTFB) and Largest Contentful Paint (LCP) on both category and product pages. A key factor in this significant improvement is Speed Kit's capability to cache dynamic HTML resources of pages that without Speed Kit would not be cacheable.


The impact of Speed Kit was proven through an A/B test based on Real User Monitoring Data (RUM).

Time to First Byte (TTFB) in milliseconds:

For category Pages, the median Time to First Byte (TTFB) was accelerated from 234 ms to 67 ms on desktop and from 265 ms to 107 ms on mobile. The median First Contentful Paint (FCP) on category pages was decreased from 452 ms to 289 ms on desktop and from 585 ms to 438 ms on mobile.

Largest Contentful Paint (LCP) on product pages:

The median Largest Contentful Paint (LCP) was improved on product pages from 1510 ms to 947 ms on desktop and from 1642 ms to 1332 ms on mobile.


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