<![CDATA[Marc Radziwills Web Performance Blog RSS Feed]]> Marc Radziwill newsletter news from the web performance expert: exclusive tips and trends for web performance, JavaScript and workshops Fri Jun 18 2021 02:00:00 GMT+0200 (Central European Summer Time) https://marcradziwill.com/assets/images/marc_grey.png-100w.png https://marcradziwill.com/ © 2025 Marc Radziwill Marc Radziwill hallo@marcradziwill.com https://marcradziwill.com/blog/six-pillars-of-web-performance/ My Six Pillars of Web Performance Marc Radziwill hallo@marcradziwill.com 2023-02-01T00:00:00Z While working on a talk for an event in my local area, I thought about the main topics you want someone to know about web performance. My talk was about how to relate site speed and business metrics on a non-technical level. I came up with six... article in my blog.]]> https://marcradziwill.com/blog/one-year-with-eleventy-after-leaving-gatsbyjs/ One year with Eleventy after leaving GatsbyJS Marc Radziwill hallo@marcradziwill.com 2023-02-01T00:00:00Z Last year I published a blog post about why I moved my site from gatsby to Eleventy. I was struggling with Gatsby because of the enormous JavaScript overhead. If you are new to Eleventy, I recommend you read my first post before continuing. Now it's... article in my blog.]]> https://marcradziwill.com/de/blog/nachhaltigkeit-bei-digitalen-entwicklungen-auf-dem-pruefstand/ Nachhaltigkeit bei digitalen Entwicklungen auf dem Prüfstand Marc Radziwill hallo@marcradziwill.com 2025-10-12T00:00:00Z Aktualisierung (Oktober 2025): Dieser Artikel wurde ursprünglich im Januar 2021 veröffentlicht. Die Unternehmensanalyse und Messdaten stammen aus Dezember 2020 und dienen als historische Referenz. Die grundlegenden Prinzipien für nachhaltige... article in my blog.]]> https://marcradziwill.com/blog/sustainability-in-digital-developments/ Sustainability in digital developments Marc Radziwill hallo@marcradziwill.com 2021-01-21T00:00:00Z The development of modern technologies continuously creates a multitude of new digitization possibilities. Digital change is simplifying many processes in business and society. All the advantages cover-up that digital technologies can also have... article in my blog.]]> https://marcradziwill.com/blog/2020-in-review/ 2020 in Review Marc Radziwill hallo@marcradziwill.com 2021-01-13T00:00:00Z 2020 was crazy in many ways. It was an exciting year for my self-employment. I decided to take off from all my projects as of the first of January to reposition myself. I started blogging about web performance, accessibility, freelancing, and... article in my blog.]]> https://marcradziwill.com/blog/web-performance-rail-model/ Web performance RAIL model Marc Radziwill hallo@marcradziwill.com 2025-10-12T00:00:00Z Update (October 2025): This post was originally published in October 2020. The RAIL model remains a valuable mental framework for understanding user-centric performance. While the industry has evolved to focus on Core Web Vitals (LCP, INP, CLS) as... article in my blog.]]> https://marcradziwill.com/blog/iframe-lazy-loading/ Native lazy-loading offscreen iframes Marc Radziwill hallo@marcradziwill.com 2023-02-01T00:00:00Z Lazy loading is a loading strategy that makes it possible to load something later. You may know this from Gatsby, React, or for images. Images or iframes below the fold can load later. Since version 76, Chrome supports native lazy-loading for images.... article in my blog.]]> https://marcradziwill.com/blog/user-centric-performance-metrics-lab-vs-rum/ User centric performance metrics - Lab vs. RUM Marc Radziwill hallo@marcradziwill.com 2025-10-12T00:00:00Z Update (October 2025): This post was originally published in October 2020. The lab vs. RUM distinction remains fundamental to performance monitoring. Since then, the ecosystem has matured significantly: the Chrome User Experience Report (CrUX)... article in my blog.]]> https://marcradziwill.com/blog/make-your-website-fast-with-adaptive-loading/ Make your website fast for the low-end with adaptive loading Marc Radziwill hallo@marcradziwill.com 2025-10-12T00:00:00Z Update (October 2025): This post was originally published in September 2020. The adaptive loading pattern remains highly relevant for optimizing user experience across diverse devices and network conditions. Note that the Network Information API... article in my blog.]]> https://marcradziwill.com/blog/how-can-performance-improve-conversion/ How can performance improve conversion? Marc Radziwill hallo@marcradziwill.com 2020-09-23T00:00:00Z What should you measure to improve performance Web performance is a crucial indicator of the conversion rate. While you are optimizing your website's performance, you can work in different areas. For example, these areas could be the load time, the... article in my blog.]]> https://marcradziwill.com/blog/third-party-web-performance/ Manage third-party web performance Marc Radziwill hallo@marcradziwill.com 2025-10-12T00:00:00Z Update (October 2025): This post was originally published in September 2020. Third-party script management remains one of the most critical web performance challenges. The techniques described here (async/defer, CSP, SRI, conditional loading) are... article in my blog.]]> https://marcradziwill.com/blog/milliseconds-make-millions/ Milliseconds make millions Marc Radziwill hallo@marcradziwill.com 2025-10-12T00:00:00Z Update (October 2025): This post was originally published in September 2020 about the Deloitte &quot;Milliseconds Make Millions&quot; study. The study's business impact findings remain highly relevant and continue to be validated by subsequent... article in my blog.]]> https://marcradziwill.com/blog/ten-web-performance-quick-wins-in-under-five-minutes/ 10 Web Performance quick wins you can and should apply in under 5 minutes Marc Radziwill hallo@marcradziwill.com 2025-10-12T00:00:00Z Update (October 2025): This post was originally published in August 2020. Most techniques remain highly effective, though the ecosystem has evolved: native lazy loading is now widely supported (loading=&quot;lazy&quot;), AVIF image format offers... article in my blog.]]> https://marcradziwill.com/blog/business-value-of-speed-part-three-optimizations/ The Business Value of Speed - A How-To Guide - Part 3: Optimizations for the Critical Rendering Path Marc Radziwill hallo@marcradziwill.com 2025-10-12T00:00:00Z Update (October 2025): This post was originally published in July 2020. The optimization techniques presented here remain foundational and effective for improving Critical Rendering Path performance. While the tooling ecosystem has evolved (with... article in my blog.]]> https://marcradziwill.com/blog/business-value-of-speed-part-two-metrics-and-mapping-of-business-values/ The Business Value of Speed - A How-To Guide - Part 2: Metrics and mapping of Business Values Marc Radziwill hallo@marcradziwill.com 2025-10-12T00:00:00Z Update (October 2025): This post was originally published in July 2020. In March 2024, Google replaced First Input Delay (FID) with Interaction to Next Paint (INP) as a Core Web Vital. This update reflects those changes with INP replacing FID... article in my blog.]]> https://marcradziwill.com/blog/business-value-of-speed-part-one-critical-rendering-path/ The Business Value of Speed - A How-To Guide - Part 1: The Critical Rendering Path Marc Radziwill hallo@marcradziwill.com 2025-10-12T00:00:00Z Update (October 2025): This post was originally published in July 2020. The Critical Rendering Path concepts explained here remain foundational and evergreen. While modern performance measurement has evolved to include Core Web Vitals (LCP, INP,... article in my blog.]]> https://marcradziwill.com/blog/svelte-bind-directive-a-cheatsheet/ Svelte bind directive - A cheatsheet Marc Radziwill hallo@marcradziwill.com 2025-10-12T00:00:00Z Update (October 2025): This post was originally written for Svelte 3 in 2020. Good news: The bind: directive syntax shown in this cheatsheet still works in Svelte 5! While Svelte 5 introduces runes ($state, $derived, $effect) for reactive state... article in my blog.]]> https://marcradziwill.com/blog/web-performance-trends-in-2020-you-should-keep-an-eye-on/ Web Performance Trends in 2020 you should keep an eye on Marc Radziwill hallo@marcradziwill.com 2020-06-24T00:00:00Z The Web Performance area is improving and has some awesome stuff to explore, but at the end of 2020, not all of our sites will be fast. Many tech people talk about 5G and HTTP/3, but there are much more new frameworks, tools and languages to explore.... article in my blog.]]> https://marcradziwill.com/blog/why-you-should-care-about-web-performance/ Why you should care about Web Performance Marc Radziwill hallo@marcradziwill.com 2020-06-22T00:00:00Z If you find yourself caring about values like Bounce rate, Revenue, Time on site, page views, user satisfaction, online business success, you should care about web performance! Web Performance is not only a topic for nerds. Web Performance is about... article in my blog.]]> https://marcradziwill.com/blog/introducing-the-core-web-vitals-for-a-healthy-website/ Introducing the Core Web Vitals for a healthy website Marc Radziwill hallo@marcradziwill.com 2025-10-12T00:00:00Z What are web vitals and why do we need them? Update (October 2025): This post was originally published in May 2020. In March 2024, Google replaced First Input Delay (FID) with Interaction to Next Paint (INP) as a Core Web Vital. This article has... article in my blog.]]> https://marcradziwill.com/blog/tante-hilde-a-free-virtual-marketplace-for-your-local-stores/ Tante Hilde - A free virtual marketplace for your local stores Marc Radziwill hallo@marcradziwill.com 2020-04-18T00:00:00Z We help searchers by bundling and clearly presenting all online and delivery offers in the Allgäu. We support the small shops and service providers in the Allgäu, which we have become fond of and which we painfully miss in times like these. (Tante... article in my blog.]]> https://marcradziwill.com/blog/mastering-javascript-high-performance/ Mastering JavaScript high performance in V8 Marc Radziwill hallo@marcradziwill.com 2023-01-31T00:00:00Z Intro to JavaScript performance optimization JavaScript performance optimization techniques for the JavaScirpt engine are simple to apply if you stick to some &quot;rules&quot; or better-said bits of advice. The implementation of these rules come... article in my blog.]]> https://marcradziwill.com/blog/how-to-use-events-in-svelte/ How to use events in Svelte Marc Radziwill hallo@marcradziwill.com 2025-10-12T00:00:00Z Intro to Svelte events Update (October 2025): This post was originally written for Svelte 3 in 2020. While DOM event handlers (on:click, etc.) still work identically in Svelte 5, component events have evolved significantly. Svelte 5 deprecates... article in my blog.]]> https://marcradziwill.com/blog/why-you-should-try-svelte/ Why you should try Svelte Marc Radziwill hallo@marcradziwill.com 2025-10-12T00:00:00Z Update (October 2025): This post was originally published in January 2020 about Svelte 3. Since then, Svelte has evolved significantly with Svelte 5 (released in 2024) introducing runes, a new reactivity model, and improved performance. The core... article in my blog.]]> https://marcradziwill.com/blog/can-i-use-service-workers-for-my-website/ Can I use service workers for my website? Marc Radziwill hallo@marcradziwill.com 2023-02-01T00:00:00Z Intro to service workers So you probably landed here because you do not use service workers in your app and you want to know how they can help you. via GIPHY --> No need to worry. We go through all the service worker API in... article in my blog.]]>