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GeezerVison is showing github.com — lemire - Overview

@lemire lemire Follow
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@lemire
lemire
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🚀
working hard and fast

Daniel Lemire lemire

🚀
working hard and fast
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Software performance expert. Ranked in the top 2% of scientists globally (Stanford/Elsevier 2025) and among GitHub's top 1000 developers.
8.4k followers · 71 following
  • Université du Québec (TELUQ)
  • Montreal, Quebec, Canada
  • http://lemire.me/en/
  • @lemire
  • @[email protected]
  • in/dlemire
  • @lemire.bsky.social

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@strager
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@orisano
@mdcallag
@deepankarsharma
@janderson066
@8exgh
@sereimar
@MarcinZukowski
@user959

Achievements

Achievement: Pair Extraordinairex4Achievement: Galaxy Brainx3Achievement: Pull Sharkx4Achievement: QuickdrawAchievement: YOLOAchievement: Arctic Code Vault ContributorAchievement: Starstruckx4

Achievements

Achievement: Pair Extraordinairex4Achievement: Galaxy Brainx3Achievement: Pull Sharkx4Achievement: QuickdrawAchievement: YOLOAchievement: Arctic Code Vault ContributorAchievement: Starstruckx4

Highlights

  • Pro

Organizations

@nodejs @RoaringBitmap @web-platform-tests @FastFilter @simdjson @fastfloat @simdutf @bits-and-blooms @ada-url @fast-pack
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lemire/README.md

I am a computer science professor at the Université du Québec. 🇨🇦

  • 📰 I write about software performance weekly on my blog.
  • 🏫 Among world's top 2% scientists (Stanford University/Elsevier ranking).
  • 📺 I gave a best voted talk at QCon San Francisco on JSON parsing.
  • 🎥 We have a CppCon 2025 talk on super fast JSON processing using C++26 reflection.
  • 🗺️ My software and algorithms are in most browsers and many standard libraries.
  • 📄 I wrote over 100 research papers including over 60 journal articles.
  • 📖 I am editor of the Software: Practice and Experience journal (Wiley); it was founded in 1971.
  • 📎 On‐demand JSON: A better way to parse documents? was the most read article of the last 5 years at SPE (2024).
  • 📎 Parsing millions of URLs per second was the most read article of the last 5 years at SPE (2025).
  • 📘 I have written many books, my latest books: Mastering Programming: From Testing to Performance in Go and Faster Than You Think: Essays on Thinking Better and Building Faster

Pinned Loading

  1. simdjson/simdjson simdjson/simdjson Public

    Parsing gigabytes of JSON per second : used by Facebook/Meta Velox, the Node.js runtime, ClickHouse, WatermelonDB, Apache Doris, Milvus, StarRocks

    C++ 24.6k 1.4k

  2. RoaringBitmap/RoaringBitmap RoaringBitmap/RoaringBitmap Public

    A better compressed bitset in Java: used by Apache Spark, Netflix Atlas, Apache Pinot, Tablesaw, and many others

    Java 4k 600

  3. RoaringBitmap/roaring RoaringBitmap/roaring Public

    Roaring bitmaps in Go (golang), used by InfluxDB, Bleve, DataDog

    Go 3k 262

  4. fastfloat/fast_float fastfloat/fast_float Public

    Fast and exact implementation of the C++ from_chars functions for number types: 4x to 10x faster than strtod, part of GCC 12, MySQL, DuckDB, Chromium, Redis and WebKit/Safari

    C++ 2.1k 204

  5. simdutf/simdutf simdutf/simdutf Public

    Unicode routines (UTF8, UTF16, UTF32) and Base64: billions of characters per second using SSE2, AVX2, NEON, AVX-512, RISC-V Vector Extension, LoongArch64, POWER. Part of Node.js, WebKit/Safari, Lad…

    C++ 2k 164

  6. ada-url/ada ada-url/ada Public

    WHATWG-compliant and fast URL parser written in modern C++, part of Internet Archive, Node.js, Clickhouse, Redpanda, Kong, Telegram, Adguard, Datadog and Cloudflare Workers.

    C++ 1.9k 152

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