Arthur Pastel
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apas.tel
Arthur Pastel
@apas.tel
Co-founder @codspeed.io • Building trustable and consistent performance tooling • Python, Rust, TypeScript • Creator of ODMantic • apas.tel
Announcing p99.chat, 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!
June 5, 2025 at 12:48 PM
We’re at @pyconit.bsky.social with @adriencaccia.bsky.social!
We’ll quizz you on Python performance again tomorrow! See you in room lasagna at 11:45!
May 30, 2025 at 8:56 PM
Super excited about our latest changes to make performance testing more accessible! Two significant changes:

✅ The Free plan now includes private repositories (up to 5 users)
✅ Macro Runners are now globally available (bare-metal ARM64, 16 cores, 32GB RAM) with 120 min/month included for free
March 4, 2025 at 3:56 PM
We now support sharded benchmark execution to provide even faster performance feedback!
February 28, 2025 at 3:24 PM
But physics is catching up. As transistors shrink, heat and power constraints limit clock speed gains. But to keep Moore’s Law going, we stack more cores. GPUs push this further with thousands of parallel cores, mentioning exponential performance increase but omitting the implementation complexity.
February 19, 2025 at 9:48 AM
Single-core performance gains have largely plateaued. That means no more relying on “free” hardware speed boosts. CPUs haven't stopped improving, but we must actively tap into new architectures. Concurrency, SIMD, and thoughtful optimizations can still unlock impressive speedups.

February 19, 2025 at 9:48 AM
`x * x` generates exactly the same assembly as `x.pow(2)` in Rust and this goes even beyond powers of 2, thanks to LLVM loop unrolling and exponentiation by squaring.
February 17, 2025 at 2:48 PM
Started hacking on a small TUI for managing EC2 instances and SSH connections. Can’t wait to ditch AWS Console's clunkiness.
February 12, 2025 at 10:21 PM
Lets go! I’ll be in Pittsburgh again in may for PyCon US 2025! Super excited to try a new interactive talk format this year!
February 10, 2025 at 10:44 PM