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Technical SEO blog: indexing, performance and AI answers

In this technical SEO blog I write down what I find when I review real sites, in the order people ask me. People ask me why a page doesn't show up on Google and why PageSpeed gives a different score every time. They also ask what actually works to appear in AI answers.

Every claim carries its source, and every figure the date I measured it. If you'd rather do it yourself, step by step, go to the technical SEO guides.

A laptop next to a coffee mug, in low light
Photo: Alex Knight · Unsplash

· 6 min

What is llms.txt, and which AI crawlers asked for mine

What the llms.txt file proposes and why Google Search says in writing that it doesn't use it. Plus one measurement from my own server: which AI crawlers asked for it in the domain's first 16 days.

Google Analytics 4 for regresoempresarial.com: google / organic and google / cpc sessions in separate rows
My own screenshot, from this piece

· 9 min

SEO vs SEM: the difference, and when to use each

What each one is, how fast it works and what happens when you stop paying. When to run both, with a real case that measures them separately.

Two hands working out sums on a calculator next to a keyboard and a mug
Photo: Towfiqu barbhuiya · Unsplash

· 9 min

How much does a small business website cost in 2026?

How much does a website cost? The median of 10 US small business packages is $2,400 in 2026. See what moves the price, upkeep costs and what to ask.

Isn't your case here?

Tell me what's happening with your site. I'll answer myself, in writing, within two business days. If your question helps other people too, it may become the next article.