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How unsafe Rust made Polars 30x times faster than Pandas

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Source: Let's Get Rusty
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  • description: 👉Join the Rust Live Accelerator waitlist: https://letsgetrusty.com/join/wv-l6tisoOzTuk Learn how Polars uses unsafe Rust to improve DataFrame performance through unchecked indexing, uninitialized buffers, shared raw pointers, trusted iterator lengths, and zero-copy type reinterpretation. This video explains the performance benefits of each technique, the safety guarantees developers must uphold, and how Polars keeps unsafe implementation details behind a safe public API. Chapters: 0:00 Intro 00:48 Unchecked Indexing 02:06 Building buffers without zero initialization 03:19 Sharing raw pointers across threads 04:53 Exact iterator lengths with TrustedLen 05:46 Zero-copy conversion with transmute 07:11 How Polars keeps Unsafe Rust internal
  • title: How unsafe Rust made Polars 30x times faster than Pandas
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  • updated_at: 2026-08-04T02:00:15Z
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