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CodSpeed
Company blog · codspeed.io/blog · on HN as adriencacciaprogrammingsystems
CodSpeed is the company blog at codspeed.io, writing about programming and systems. Since 2023, 8 different Hacker News readers have linked it 26 times, most often “Rust 1.78: Performance Impact of the 128-Bit Memory Alignment Fix”. It is still writing: the last post was on 2026-03-03, and you can follow it by feed.
Build features while CodSpeed makes them fast: benchmarks that run in your CI, regressions caught in the pull request, and optimizations proposed for you.
Most-linked posts?
- Rust 1.78: Performance Impact of the 128-Bit Memory Alignment Fix3 people · 3 mentions · first linked 2024-05-09
- Advent of CodSpeed3 people · 3 mentions · first linked 2024-11-29
- Why glibc is faster on some GitHub Actions Runners2 people · 3 mentions · first linked 2026-02-14
- CodSpeed – integrated CI tool for performance testing2 people · 2 mentions · first linked 2023-07-11
- Benchmarks in CI: Escaping the Cloud Chaos2 people · 2 mentions · first linked 2025-07-30
What Hacker News says?
Take a look at my repo - http://github.com/nindalf/advent-2024 Each day is a new module, this way I don't have to think of new names for part1() and part2(). I can still import code from the rest of the crate if I want with `use crate::`. If you like this style of structuring the project, you may be interested in the generator I use for it - http://github.com/nindalf/aocgen . `aocgen --day 2` will create these files…
Comment linking /advent/day/1
on “Advent of Code 2024”Submitted State of Python 3.13 performance: Free-threading as a story · 196 points
HN discussionHere's a website that appears to be about competing on the performance of each solution: https://codspeed.io/advent
Comment linking /advent
on “Advent of Code 2024”Submitted Rust 1.78: Performance Impact of the 128-Bit Memory Alignment Fix as a story · 83 points
HN discussionCodSpeed | Founding AI Engineer | On-site (Paris) / Remote (Europe) | Full-time | https://codspeed.io We're building software performance optimization tools to optimize and measure code performance before it is deployed to production. We avoid regressions that impact UX and help developers solve their performance issues faster. We're already live and trusted by top-tier open-source project teams such as Pydantic, Ru…
Comment linking /
on “Ask HN: Who is hiring? (March 2025)”Submitted CodSpeed – integrated CI tool for performance testing as a story · 22 points
HN discussionYes, totally. Most of the time we can even raise a warning with an even lower regression threshold, for example in this benchmark from pydantic-core, there is a less than 1% variance in the results and we can easily detect performance changes of less than 5%: https://codspeed.io/pydantic/pydantic-core/benchmarks/tests/...
Comment linking /pydantic/pydantic-core/benchmarks/tests/benchmarks/test_micro_benchmarks.py::test_definition_in_tree
on “CodSpeed: Continuous Performance Measurement”Submitted Benchmarks in CI: Escaping the Cloud Chaos as a story · 21 points
HN discussionCodSpeed | Multiple Positions | On-site (Paris) / Remote (Europe) | Full-time | https://codspeed.io We’re building the continuous performance optimization platform. We help engineering teams catch performance regressions before they ship, with sub-1% measurement variance. We’re already trusted by teams at Cloudflare, Vercel, Mozilla, Pydantic, and Astral (Ruff, uv). We’re a small, deeply technical team looking for e…
Comment linking /
on “Ask HN: Who is hiring? (March 2026)”Submitted How to Benchmark Rust Code as a story · 7 points
HN discussionSubmitted Why glibc is faster on some GitHub Actions Runners as a story · 6 points
HN discussionSubmitted How to Benchmark C++ Code as a story · 5 points
HN discussionSubmitted Advent of CodSpeed as a story · 5 points
HN discussionSubmitted Rust 1.78: Performance Impact of the 128-Bit Memory Alignment Fix as a story · 5 points
HN discussionSubmitted Why glibc is faster on some GitHub Actions Runners as a story · 4 points
HN discussionSubmitted Rust 1.78: Performance Impact of the 128-bit Memory Alignment Fix as a story · 4 points
HN discussionSubmitted CodSpeed: Continuous Performance Measurement as a story · 4 points
HN discussionSubmitted Benchmarking a Golang Gin HTTP API as a story · 3 points
HN discussionSubmitted Benchmarks in CI: Escaping the Cloud Chaos as a story · 3 points
HN discussionSubmitted I updated the README and my Benchmarks Regressed as a story · 2 points
HN discussionSubmitted One Pytest Marker to Track the Performance of Your Tests as a story · 2 points
HN discussionSubmitted Using Vitest bench to track performance regressions in your CI as a story · 2 points
HN discussionSubmitted Flame Graphs as a Service as a story · 2 points
HN discussionSubmitted Why Rust doesn't need a standard div_rem: An LLVM tale as a story · 2 points
HN discussionSubmitted I updated the README and my Benchmarks Regressed as a story · 1 points
HN discussionSubmitted Advent of CodSpeed – a Rust Performance Leaderboard for the Advent of Code as a story · 1 points
HN discussion
