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Field notes on technical SEO

Audits, ranking experiments and the odd strong opinion, written by the team that builds the crawler.

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Research4 November 20267 min read What 50,000 crawls taught us about indexation debt We looked at a year of crawls across 1,100 sites. Most indexation problems were not caused by content at all. Read article

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28 October 2026 How technical SEO compounds into long-term growthSmall fixes rarely look exciting in week one. Twelve months later they are the whole graph.Technical SEO6 min read 21 October 2026 INP is live: what actually broke on real sitesInteraction to Next Paint replaced FID. Here is what failed first on the sites we monitor.Core Web Vitals5 min read 14 October 2026 Content gaps are a crawl problem before they are a writing problemBefore you brief a new article, check whether the page you already have is even being found.Content strategy6 min read 7 October 2026 How Halcyon cut indexation debt by 71% in six weeksA marketplace with 400,000 URLs, a tiny team and one very long backlog. Here is the order they fixed it in.Case study8 min read 30 September 2026 Continuous crawling, explainedWhat changes when an audit stops being a monthly event and becomes something that simply runs.Product4 min read 23 September 2026 Schema markup that search engines actually useMost structured data is ignored. A short list of types still earns rich results in 2026.Technical SEO5 min read 16 September 2026 Layout shift is a design system bugCLS rarely comes from one page. It comes from one component used on all of them.Core Web Vitals5 min read 9 September 2026 Search intent has a shelf lifeThe page that ranked for a query last year may answer a question people no longer ask.Content strategy4 min read

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