FastSearch · Google grounding system
FastSearch is an accelerated retrieval system at Google, faster than the classic search algorithm but consulting fewer sources. It is used to ground Gemini’s answers, and Search Engine Journal links it to the generation of AI Overviews.
Standalone definition · 37 words
What do we know about FastSearch?
Its existence is known from the US antitrust ruling against Google, which states that Google uses a proprietary technology called FastSearch to ground its Gemini models. Google has not published technical documentation for site owners. How it works therefore remains inference.
Why does FastSearch interest SEOs?
If grounding relies on a system different from classic ranking, a good ranking does not guarantee a citation, and the reverse is possible. Ryan Jones flagged the passage of the ruling and ties selection to semantic relevance rather than links. It is an interpretation to handle with care.
What should you do in practice?
Nothing specific can be configured. The levers are those of semantic relevance: clear passages, well-identified entities, clean indexing. Measure the effect with Search Console’s generative AI report and by comparing cited pages with well-ranked pages.
Frequently asked questions
Is FastSearch documented by Google?
Not for publishers. Its public mention comes from a court ruling.
Does FastSearch replace Google’s index?
No source says so. The eligibility conditions published by Google remain indexing and snippet eligibility.
Do links count for FastSearch?
It is debated. Search Engine Journal reports the hypothesis of a limited role for links, with no official confirmation.
Related terms
Further reading
- Google AI Overviews VS Google AI Mode, what are the differences ?
- Checklist GEO and LLM / AI 2026
- ← Back to the GEO glossary (114 terms)