CSS Wizardry Blog Archives – CSS Wizardry

This is the full archive of everything I’ve published here: 267 articles on web performance, site-speed, Core Web Vitals, caching, browser behaviour, and the occasional older CSS piece. Try The single responsibility principle applied to CSS (2012) at random.
Hi there, I’m Harry Roberts. I am an award-winning Consultant Web Performance Engineer, designer, developer, writer, and speaker from the UK. I write, Tweet, speak, and share code about measuring and improving site-speed. You should hire me.
My secret blog: occasional notes on consulting, web performance, and the industry. For those in the know. Learn more…
I help teams achieve class-leading web performance, providing consultancy, guidance, and hands-on expertise.
I specialise in tackling complex, large-scale projects where speed, scalability, and reliability are critical to success.
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