Guillaume Lagrange

Software developer

[Arthur Pastel @Art049]

A flame graph that merges all threads is lying to you. That "hot" function might be a GC thread, not the request path.

You can now filter flame graphs down to specific processes and threads, or split them to see exactly how the work is distributed in @codspeedhq

Also available in the CodSpeed MCP: your coding agent profiles the exact worker it's optimizing.

[Arthur Pastel @Art049]

CodSpeed can now optimize your code for you.
The agent runs benchmarks with CPU simulation, generates profiling data, and iterates: edit, measure, compare. It stops when it finds something measurable. You get the diff + a PR.

[Charlie Marsh @charliermarsh]

/goal for finding silly one-line optimizations that speed up your parser by 20-30%

[Jiahan Chen @jiahan_c]

Things get wild when @hardfist_1 uses Codex.

He just made SWC parser 20% faster and minifier 10% faster 🤯

[Arthur Pastel @Art049]

CodSpeed now supports Java ☕

[CodSpeed @codspeedhq]

New blog post on unexpected variance
https://t.co/6YQTFWFk12

[CodSpeed @codspeedhq]

For the last launch of the week, the CLI just dropped 🚀

[CodSpeed @codspeedhq]

You can now search and filter performance tests across the app 🔎

[Arthur Pastel @Art049]

Launch week, update #4
Search + filtering across all benchmark pages.

GitHub-style queries like:
`is:regression mode:walltime parser` 👇

[Arthur Pastel @Art049]

Launch Week II, Day 3: @CodSpeedHQ Memory Instrument 🧠

Memory tracking in CI with:
• peak memory
• total allocations/bytes
• allocation timeline

Flip on `mode: memory` and spot leaks + regressions early!

[CodSpeed @codspeedhq]

Day 2: WallTime granularity improvement! ✨

[Arthur Pastel @Art049]

Launch Week II, Day 1: Meet the Wizard 🧙

Our agent analyzes your repo, hooks up benchmarks, generates CI workflows, and opens a PR installing CodSpeed
Watch it set up a repo from scratch 👇

[Arthur Pastel @Art049]

We now support OIDC authentication for workflows 🎉

No more authentication token, enhanced security, and simply a more straightforward setup!

https://t.co/pOnMUXmyqM

[Adrien Cacciaguerra @adriencaccia]

A new "how to benchmark" guide is available, this time for Rust 🦀

For a language often chosen for speed without compromising safety, being able to measure performance is paramount.

This guide covers everything from basic setup to CI integration.

https://t.co/FbNS9FGyga

[Arthur Pastel @Art049]

We just released a new guide on writing benchmarks in Python. It encapsulates the most common and useful patterns we've seen while building @codspeedhq
Check it out ✨👇

https://t.co/PYE5RS5ZLg

[Adrien Cacciaguerra @adriencaccia]

I just wrote a guide on how to test the performance of your Python code with benchmarks. It 's a good place to start if you never did it!

https://t.co/TRrCNnG47O

[Arthur Pastel @Art049]

Excited to have it out! 🎉 This is just the first step toward adaptive instrumentation: get an overview with wall-time profiling, then zoom in with CPU simulation or other instruments to reach instruction-level detail.
This also edges us nearer to real-world sampling in production 👀

[Arthur Pastel @Art049]

🚀🦫 New guide for Gophers: Benchmarking a Gin HTTP API

https://t.co/S4rzQb37xu

[Guillaume Lagrange @G_Lagrange]

@TeamVitalityCS @ropz @Vitality_apEX @flameZcsgo @kingmezii @zywoo C'est déjà la honte de base Kick, mais ce timing ne peut pas être plus horrible

[Arthur Pastel @Art049]

Announcing https://t.co/ZEHVyLR3XR, the assistant for software performance optimization 🚀

Describe your performance challenge, share your code, and p99 will analyze, instrument, and visualize the results, cutting the traditional setup overhead down to seconds!