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Rust-to-x86 Assembly Port — 17x Faster Screensaver

DHH

@dhh · 911.5K followers

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Sep 25, 2026

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DHH used Claude Opus 5.5 in a single shot to translate the Omarchy screensaver engine (ttfx) from Rust into hand-tuned x86-64 assembly — and the result runs 17x faster. The output is a real GitHub PR with working assembly code, not a toy example. It's a dramatic demonstration of what agentic AI can do at the systems-programming level: one prompt, one translation, a massive performance leap on bare metal.

One-shot translation from Rust to x86-64 assembly with no human rewriting
17x performance improvement over the original Rust implementation
Real artifact: a merged GitHub PR on the open-source ttfx screensaver engine

“I ported the Omarchy screensaver engine (ttfx) from Rust to x86-64 assembler, and it's up to 17x faster!! One-shot translation by Opus 5.5. We keep drilling until the agentic drill bit hits bedrock! https://github.com/omacom/ttfx/pull/35/”
— @dhh

assembly rust performance one-shot systems-programming open-source dark-mode minimal