Web Performance Optimisation, Consultancy, and Engineering

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

Web Performance and Site-Speed Insights

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

26 March, 2014
Naming UI components in OOCSS
21 January, 2014
Use zero-width spaces to stop annoying Twitter users
7 January, 2014
Extending silent classes in Sass
17 December, 2013
Workshop: Event Handler, London, February 2014
16 December, 2013
I wrote (part of) a book!
5 December, 2013
My setup
24 November, 2013
The problems with ‘crafting’ code
22 November, 2013
Taming data tables
6 November, 2013
Workshop: Smashing Workshops, Zürich, December 2013
4 November, 2013
Code reviews as a service

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.

Connect

Projects

ITCSS – coming soon…

Next Appearance

Talk
ANWB Front-End Summit: The Hague (Netherlands), June 2025

Learn:

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.

Start a Conversation

.site-nav__list { content-visibility: visible; }

Audits

Consultancy

Training