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.

13 August, 2019
Making Cloud.typography Fast(er)
8 August, 2019
Time to First Byte: What It Is and How to Improve It
31 May, 2019
Self-Host Your Static Assets
25 April, 2019
Tips for Technical Interviews
4 March, 2019
Cache-Control for Civilians
31 January, 2019
Bandwidth or Latency: When to Optimise for Which
26 November, 2018
ITCSS × Skillshare
23 November, 2018
What If?
9 November, 2018
CSS and Network Performance
27 October, 2018
The Three Types of Performance Testing

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.

Suffering? Fix It Fast!

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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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