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Simple Code, High Performance

Molly Rocket · 463.8K views · 2021-10-13 · 2:50:14

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Overview

Casey Muratori's University of Twente guest lecture is a case study in how straightforward code can cut thousands of lines and tens of seconds of runtime down to a few dozen lines running in under a second. It uses concrete examples to show why software is often an order of magnitude slower than it should be.

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HN people recommend it to anyone wanting a practical sense of what CPUs can really do and why abstraction layers cost so much performance.

Recommended by 6 HN people across 6 months · HN mentions 2021–2025

Topics

Software performance & optimizationComputer architecture & CPUs
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optimizationsimdcpu architecturecasey muratorigame programmingabstraction cost

What people said

Pr0ject217 · 2022-12 · Strong recommendation

Thank you for the detailed explanation! It sounds like programming computers back then would have been a joy. Casey Muratori's talks[0] on performance and optimization sparked an interest in me to start putting thought into what the CPU actually does (which wasn't taught when I learned web development). Since discovering his talks, I've been on the hunt for more learning materials. [0] [VIDEO]

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mrv_asura · 2022-03 · Strong recommendation

The timing of this is great! I just watched Casey Muratori's lecture, "Simple Code, High Performance"[1] and its follow-up videos[2, 3]. I highly recommend watching it. It is about Software Optimization, and gives practical and high-level understanding of topics like CPU Architecture, SIMD etc. [1] [VIDEO] [2] [LINK] [3] [LINK]

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DrBazza · 2021-11 · Strong recommendation

> Speak for yourself; most phones I see still take 2+ seconds to open some apps. Why is that though? I've written code since the 8 bit days of BBC micros and ZX Spectrums. Casey Muratori's (who has been on here a lot lately) talk nails it [1] - developers just don't realise how fast their code could and should run. And the fact that we have layers upon layers of frameworks and no one cares. [1] [VIDEO]

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Sources

Video by Molly Rocket, played through YouTube.

Data and selection notes

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HN Library: HackerTube export (2026-10-31) and open-index/hacker-news. Upstream summaries and classifications may contain AI errors.

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