---
title: "Stefan Wintermeyer · 2026-08-28"
description: "Great engineering story from Cloudflare: optimizing a DNS cache entry from 953 to 420 bytes freed ~100 TB of RAM. At 250 billion cache entries, even saving a single byte matters."
url: https://vutuv.de/wintermeyer/posts/01a0485d-b638-7195-94bc-d7d28b517d99
type: post
schema_version: 3
generated_at: 2026-08-30T07:58:32Z
---

# Post by [Stefan Wintermeyer](https://vutuv.de/wintermeyer) · 2026-08-28

Great engineering story from Cloudflare: optimizing a DNS cache entry from 953 to 420 bytes freed ~100 TB of RAM. At 250 billion cache entries, even saving a single byte matters.

And the best part: using less memory also made it faster.

https://blog.cloudflare.com/dns-cache-memory-optimization-1111/

Tags: #dns, #Cloudflare, #Cache

Likes: 2 · Reposts: 0 · Bookmarks: 0

Liked by: Mihail Moroşan, Johannes Tigges