Site-Speed Optimisation – Web Performance and Site Speed Consultant

Trusted by:

Harry gave the team a strong footing for identifying performance issues on iPlayer. With his knowledge, we were able to roll out quick fixes to our audiences without the need for big rewrites, all within just two days.
Matthew Burrows, BBC iPlayer
Harry helped our team level up their scalable CSS architecture skills, and to say that he had a large impact on our work is an understatement. We can’t recommend him enough.
Addy Osmani, Google
Harry’s workshop was excellent; we left with tons of new ideas and techniques to improve both the CSS architecture and overall performance of Behance and Adobe Portfolio.
Jackie Balzer, Adobe
There’s a short list of people I whole-heartedly recommend for detailed performance work; Harry is right up there at the top.
Tim Kadlec
The CSS architecture I learned from Harry on the NHS project has changed the way I work. Bravo!
Josh Nesbitt

Articles

There are 249 articles on this blog. Find them all on the blog page.

31 July, 2017
Performance and Resilience: Stress-Testing Third Parties
2 June, 2017
Refactoring Tunnels
23 May, 2017
Little Things I Like to Do with Git
10 May, 2017
Writing Tidy Code
16 March, 2017
Configuring Git and Vim
12 February, 2017
Base64 Encoding & Performance, Part 2: Gathering Data
12 February, 2017
Base64 Encoding & Performance, Part 1: What’s Up with Base64?
8 February, 2017
Code Smells in CSS Revisited
6 February, 2017
Typography for Developers
25 January, 2017
Moving CSS Wizardry onto HTTPS and HTTP/2

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.

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ITCSS – coming soon…

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Talk
Devoxx Greece: Athens (Greece), April 2025

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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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