Performance
Why your LCP element is not what you think
Teams optimise the hero image for a fortnight and discover the LCP element was a paragraph of text the whole time.
Archive
2026
30 posts
Performance
Lazy loading everything is a mistake
A lazy attribute on the hero image delays the one thing the metric is measuring.
Performance
Compression: brotli, gzip and the flags nobody sets
Brotli at its default level is barely better than gzip. At level 11 for static files it is a different story.
Performance
Measuring on the hardware your readers own
A three-year-old phone on a shelf in the office does more for a team than any dashboard.
Performance
A week of field data beats a month of arguing
Lab numbers start arguments. Field numbers end them, because nobody can claim the lab was configured wrong.
Ask a dev
Our Lighthouse score dropped and nothing changed
It is almost always one of four things, and only one of them is your fault.