Operations | Monitoring | ITSM | DevOps | Cloud

Understanding the Chrome DevTools Timeline

Mar 17, 2025 By Request Metrics In Request Metrics
Learn how to decode flame charts in this essential Concepts of Web Performance tutorial with Todd Gardner from Request Metrics. Perfect for entry-level web developers, this quick guide demystifies the intimidating flame charts found in Chrome DevTools that visualize your browser's main thread activity. Discover how to identify performance bottlenecks by understanding the color-coding system—gray for browser tasks, blue for HTML parsing, purple for layout and paint operations, dark yellow for script compilation, and light yellow for JavaScript execution.
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Understanding JavaScript Performance with Flame Charts

Mar 15, 2025 By Request Metrics In Request Metrics
Learn how to decode flame charts in this essential Concepts of Web Performance tutorial with Todd Gardner from Request Metrics. Perfect for entry-level web developers, this quick guide demystifies the intimidating flame charts found in Chrome DevTools that visualize your browser's main thread activity. Discover how to identify performance bottlenecks by understanding the color-coding system—gray for browser tasks, blue for HTML parsing, purple for layout and paint operations, dark yellow for script compilation, and light yellow for JavaScript execution.
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A Simple HTML Document in a Flame Chart

Mar 14, 2025 By Request Metrics In Request Metrics
Learn how to decode flame charts in this essential Concepts of Web Performance tutorial with Todd Gardner from Request Metrics. Perfect for entry-level web developers, this quick guide demystifies the intimidating flame charts found in Chrome DevTools that visualize your browser's main thread activity. Discover how to identify performance bottlenecks by understanding the color-coding system—gray for browser tasks, blue for HTML parsing, purple for layout and paint operations, dark yellow for script compilation, and light yellow for JavaScript execution.
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Visualizing Browser Performance with Flame Charts

Mar 13, 2025 By Request Metrics In Request Metrics
Learn how to decode flame charts in this essential Concepts of Web Performance tutorial with Todd Gardner from Request Metrics. Perfect for entry-level web developers, this quick guide demystifies the intimidating flame charts found in Chrome DevTools that visualize your browser's main thread activity. Discover how to identify performance bottlenecks by understanding the color-coding system—gray for browser tasks, blue for HTML parsing, purple for layout and paint operations, dark yellow for script compilation, and light yellow for JavaScript execution.
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Reading Flame Charts for Web Performance

Mar 12, 2025 By Request Metrics In Request Metrics
Learn how to decode flame charts in this essential Concepts of Web Performance tutorial with Todd Gardner from Request Metrics. Perfect for entry-level web developers, this quick guide demystifies the intimidating flame charts found in Chrome DevTools that visualize your browser's main thread activity. Discover how to identify performance bottlenecks by understanding the color-coding system—gray for browser tasks, blue for HTML parsing, purple for layout and paint operations, dark yellow for script compilation, and light yellow for JavaScript execution.
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HTTP Caching Headers: The Complete Guide to Faster Websites

Feb 27, 2025 By Request Metrics In Request Metrics
The fastest website is the website that is already loaded, and that’s exactly what HTTP caching delivers. HTTP caching is a powerful technique that lets web browsers reuse previously loaded resources like pages, images, JavaScript, and CSS without downloading them again. Understanding HTTP caching headers is essential for web performance optimization, but misconfiguration can cause big performance problems.
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GTMetrix Alternatives: The Best Tools for Website Performance Testing

Feb 25, 2025 By Todd H. Gardner In Request Metrics
GTMetrix used to be the go-to tool for checking website speed, but let’s be honest—paying for one-off synthetic tests isn’t worth it. If you’re still relying on synthetic testing alone, you’re missing a big part of the web performance picture. If you care about Core Web Vitals, SEO performance, and user experience, you need more than just lab data. The good news? There are better (and free) alternatives like PageSpeed Insights and WebPageTest for synthetic testing.
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HTTP/3 is Fast!

Feb 19, 2025 By Request Metrics In Request Metrics
HTTP/3 is here, and it’s a big deal for web performance. See just how much faster it makes websites! Wait, wait, wait, what happened to HTTP/2? Wasn’t that all the rage only a few short years ago? It sure was, but there were some problems. To address them, there’s a new version of the venerable protocol working its way through the standards track. Ok, but does HTTP/3 actually make things faster? It sure does, and we’ve got the benchmarks to prove it.
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How to Optimize Website Images: The Complete 2025 Guide

Feb 4, 2025 By Request Metrics In Request Metrics
Images are big. Really big. The bytes required for an image dwarf most site’s CSS and JavaScript assets. Slow images will damage your Core Web Vitals, impacting your SEO and costing you traffic. Images are usually the element driving Largest Contentful Paint and load delays can increase your Cumulative Layout Shift. If you’re not familiar with these metrics, check them out in the Definitive Guide to Measuring Web Performance.
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Unified Web Performance: Real User Monitoring and Automatic Lighthouse Testing

Jan 13, 2025 By Todd H. Gardner In Request Metrics
At Request Metrics, we’re always looking for ways to help you make your websites faster and your users happier. Today, we’re excited to announce a major new capability: Unified Performance Monitoring. Request Metrics now combines the power of real-user monitoring with automated lab performance testing to get a complete picture of your website’s performance.
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