Web Performance Optimisation, Consultancy, and Engineering

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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

Web Performance and Site-Speed Insights

There are 237 articles on this blog. Find them all on the blog page.

17 February, 2011
Creating a pure CSS dropdown menu
17 February, 2011
Pure CSS(3) accordion
9 February, 2011
CSS powered ribbons the clean way
29 January, 2011
Create a centred horizontal navigation
23 January, 2011
Link: Recreating the Luke's Beard social icons with CSS3
23 January, 2011
Using the <body> element as a wrapper
23 January, 2011
HTML(5) and text-level semantics
18 January, 2011
Client respect
12 January, 2011
Maximising hit-area for usability
11 January, 2011
HTML elements, tags and attributes

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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ANWB Front-End Summit: The Hague (Netherlands), June 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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