Web performance guides

Each guide takes one performance problem and explains why it happens, how to find it on your own site and how to fix it. I update a guide when the facts or my advice change.

Why your LCP image loads late

If your LCP image loads late, the browser likely finds it late. On 146 slow sites I audited, the median wait was 1.29 s, the download 0.17 s. How to fix it.