# Getting Friendly With CPU Caches

DevFeed: [Getting Friendly With CPU Caches](<https://devfeed.tech/articles/getting-friendly-with-cpu-caches-22223.md>)

Original publisher: [Read original article](<https://www.ardanlabs.com/blog/2023/07/getting-friendly-with-cpu-caches.html>)

Published: 2025-10-21T00:00:00Z

Content type: tutorial

Language: en

Sources: [William Kennedy](<https://devfeed.tech/sources/william-kennedy.md>)

Topics: [CPU Cache](<https://devfeed.tech/topics/cpu-cache.md>), [Go Language](<https://devfeed.tech/topics/go-language.md>), [Data structures](<https://devfeed.tech/topics/data-structures.md>), [Programming](<https://devfeed.tech/topics/programming.md>), [Hardware](<https://devfeed.tech/topics/hardware.md>), [Caching](<https://devfeed.tech/topics/caching.md>)

Tags: [cache](<https://devfeed.tech/tags/cache.md>), [cpu](<https://devfeed.tech/tags/cpu.md>), [data](<https://devfeed.tech/tags/data.md>), [data-structures](<https://devfeed.tech/tags/data-structures.md>), [efficiency](<https://devfeed.tech/tags/efficiency.md>), [go](<https://devfeed.tech/tags/go.md>), [golang](<https://devfeed.tech/tags/golang.md>), [hardware](<https://devfeed.tech/tags/hardware.md>), [intel](<https://devfeed.tech/tags/intel.md>), [latency](<https://devfeed.tech/tags/latency.md>), [memory](<https://devfeed.tech/tags/memory.md>), [performance](<https://devfeed.tech/tags/performance.md>), [processor](<https://devfeed.tech/tags/processor.md>), [programming](<https://devfeed.tech/tags/programming.md>), [speed](<https://devfeed.tech/tags/speed.md>)

## AI overview

This tutorial explains how CPU cache behavior and data locality affect application performance. Using a Go case study, it shows that replacing a large embedded array in a user struct with a slice reduced cache misses and improved benchmark performance by more than 40 times.

## Source excerpt

Understanding how your data structures interact with hardware is one of the most powerful ways to improve application performance. This blogpost explores how CPU caches influence speed and how thoughtful struct design in Go can yield massive gains. Through a real-world case study, it shows how replacing a large embedded array with a slice improved performance by more than 40 times by reducing cache misses and improving data locality. Originally published in July 2023, its lessons remain highly relevant today for developers optimizing for memory efficiency and cache-aware programming.