Tim Kadlec helps organizations build faster, more effective websites through sustainable web performance practices. He writes about performance culture, metrics, and real-world optimization strategies.
220 articles from this blog
A guide to setting clear metrics and measurement strategies before implementing web performance optimizations to ensure measurable impact.
The author launches perfwork.com, a niche job board connecting web performance professionals with hiring companies, built with modern web tech.
Critiques the 'single visionary' myth in tech product development, arguing for collaborative, principle-driven decision-making instead of autocratic design.
Explains why good Core Web Vitals scores don't guarantee a good user experience, arguing performance is about user goals, not just metrics.
Explores differences in how Chrome's FCP and LCP metrics define 'contentful' elements, focusing on image entropy and SVG handling.
A data-driven analysis revisiting the Performance Golden Rule, showing frontend still dominates page load time, with modern data from HTTP Archive.
Web performance expert announces return to consulting, focusing on helping organizations build sustainable performance culture and tools.
Discusses the potential for Apple to allow alternative browser engines on iOS, analyzing the impact on browser diversity and competition.
A developer reflects on the value of intentionally using RSS feeds and newsletters for continuous learning and staying informed in the tech industry.
Explains how performance metric variability can reveal real website issues like race conditions, not just measurement flaws.
Summary of a conference talk on HTTP/3, covering its benefits, setup, and performance testing compared to HTTP/2.
Analysis of Ember.js performance data reveals Fandom mobile sites significantly increase median JavaScript processing times, skewing benchmarks.
Analyzes the performance and cost drawbacks of client-side A/B testing and explores edge computing as a superior alternative.
Using Netlify's redirect feature to proxy Cloudinary image requests through your own domain for performance benefits.
Explores the UX of skeleton screens for loading states, discussing their origins, benefits, and potential misuse in web development.
A developer analyzes a third-party widget causing severe performance issues, blocking the main thread for 2.5s on a high-end laptop and 48.6s on a low-end Android device.
Explores how the 'Age' HTTP header from CDNs like Netlify can interfere with link prefetching tools such as Instant.Page, impacting perceived performance gains.
A technical case study on A/B testing the instant.page prefetching library using Netlify's split testing and SpeedCurve for performance measurement.
Analyzes the performance cost of popular JavaScript frameworks like React, Vue, and Angular using HTTP Archive data.
Explains how to use WebPageTest custom metrics with request data to analyze script loading behavior in web performance testing.
