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Simon Hearne

Simon Hearne helps teams build fast search over unstructured data: vector databases, RAG pipelines, and over a decade of web performance craft.

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The beginning of the file, from our validated copy saved 2026-10-21T22:45:38.521Z. Cached copy · Source on simonhearne.com

# Simon Hearne

> Simon Hearne helps teams build fast search over unstructured data: vector databases, RAG pipelines, and over a decade of web performance craft.

Simon Hearne helps teams build fast search over unstructured data. He works at Zilliz, the company behind the Milvus open-source vector database, and writes and speaks about vector search, RAG pipelines, and search performance. Before that he spent over a decade as a web performance engineer and consultant, and is a regular conference speaker.

Canonical site: https://simonhearne.com/
Author page: https://simonhearne.com/about/
Every post below is also available as markdown by appending `index.md` to its URL.
Full text of all posts: https://simonhearne.com/llms-full.txt

## Talks

- [Vector Search, Visualised: Milvus Meetup Paris](https://simonhearne.com/2026/vector-search-visualised-paris/): A visual crash course in vector search, built around an ecommerce dress-finder: exact search, ANN indexes, quantisation, and the filters that quietly wreck your recall. (2026-10-07)
- [The RAG Cost Curve](https://simonhearne.com/2026/rag-cost-curve/): When does a retrieval index actually beat live search? Measured break-even points, not vendor claims: 334 queries a day on a short agent history, never on code the model already knows, and 24 on code… (2026-09-15)
- [Migrating to Milvus: Tooling, Deployment Choices and Lessons from Real Migrations](https://simonhearne.com/2026/migrating-to-milvus-talk/): How to move from Elasticsearch or OpenSearch to Milvus or Zilliz Cloud: migration tooling, a real end-to-end walkthrough, deployment choices, and lessons from real customer migrations. (2026-09-02)
- [Milvus 3.0: Closing the Search Gap](https://simonhearne.com/2026/milvus_search_gap/): Milvus 3.0 closes the gap between vector search and full-text search: one engine for both. A customer-backed comparison of Milvus 3.0 and Elasticsearch 9.14, with live side-by-side queries you can… (2026-08-19)
- [Vector Search, Visualised](https://simonhearne.com/2026/visualising-vector-search/): Vector search has no EXPLAIN. Through interactive visualisations, this talk shows what embeddings look like in high-dimensional space, what quantisation does to your recall, and how to catch… (2026-06-04)
- [WebPageTest Live: Third Parties and Request Map with Simon Hearne](https://simonhearne.com/2022/third-parties-request-map/): Third parties have always been a challenge. Having resources loading on your site, beyond your control isn't something users sign up for. In 2015, Simon Hearne created a tool called REQUEST MAP to… (2022-10-11)
- [An Inclusive Web is Fast by Default](https://simonhearne.com/2021/inclusive-design/): Web performance is critical to inclusive design - users on low-end devices or with poor connectivity are excluded from large and slow applications (2021-09-23)
- [The Psychology of Speed](https://simonhearne.com/2020/psychology-of-speed/): We intuitively know that faster is better, but what's the psycholog
…

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