Trust Your Benchmarks, Not Your Instincts: A Rust Performance Quiz - Arthur & Adrien | EuroRust 2025

Trust Your Benchmarks, Not Your Instincts: A Rust Performance Quiz - Arthur Pastel and Adrien Cacciaguerra at EuroRust 2025 🦀

Rust prides itself on performance and safety, but even in Rust, our intuition about what code is “fast” can often mislead us. This interactive talk challenges common performance assumptions using real-world Rust examples—and lets the audience guess which implementation is faster before revealing actual benchmark results.

From iterator chains to memory allocations, and from seemingly trivial operations to architecture-sensitive surprises, each case study will illuminate why benchmarking should guide our optimization efforts.

You’ll leave with:
• A sharper sense of where performance bottlenecks can really hide in Rust code.
• Practical examples you can take back to your own projects.
• A new appreciation for performance tooling in Rust

Whether you’re optimizing a backend service or contributing to a low-level crate, this session will test your instincts, and your name might just top the live leaderboard!

About Arthur Pastel

Arthur is a software engineer based in Paris. He has worked as an engineer in a few tech companies over the past few years and started with Rust 3 years ago. He's also passionate about (too??) many other software fields.

Two years ago, he founded CodSpeed, a Continuous Performance Analysis solution that helps tech companies and Open-Source projects prevent performance issues during development, rather than waiting until production breaks to start optimizing. They're already helping some big open-source projects optimize their performance continuously and hope to continue contributing to an overall faster ecosystem ⚡️

About Adrien Cacciaguerra

Adrien has been a Software Engineer for 7 years. He's a co-creator CodSpeed, a Continuous Performance Analysis solution that helps tech companies and Open-Source projects prevent performance issues directly in their CI pipelines.

He's passionate about Developer Experience, Performance, Open-Source, Python, TypeScript, and Rust. These passions led him to co-author Swarmion, an open-source set of tools to develop Serverless micro-services.

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