# How we halved DNS build delay and cut memory use by 85%

**URL:** <https://forum.devtalk.com/t/how-we-halved-dns-build-delay-and-cut-memory-use-by-85/251350>\
**Category:** In The News\
**Tags:** via-news-bot, memory, in-the-news\
**Created:** [3 November 2026 06:24 UTC](https://forum.devtalk.com/t/how-we-halved-dns-build-delay-and-cut-memory-use-by-85/251350 "2026-11-03T06:24:56Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![CommunityNews](https://forum.devtalk.com/user_avatar/forum.devtalk.com/communitynews/32/1113_2.png) [@CommunityNews](https://forum.devtalk.com/u/CommunityNews)\
**Post date:** [3 November 2026 06:24 UTC](https://forum.devtalk.com/t/how-we-halved-dns-build-delay-and-cut-memory-use-by-85/251350/1 "2026-11-03T06:24:56Z")

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> Zone setting changes used to rebuild entire DNS zones, even ones with tens of millions of records. Here is how we built a planner that picks the smallest safe build, cutting full builds by 40%, peak memory by 85%, and halving build delay.

Read in full here:

> **[How we halved DNS build delay and cut memory use by 85%](https://blog.cloudflare.com/dns-targeted-zone-builds/)**
>
> Zone setting changes used to rebuild entire DNS zones, even ones with tens of millions of records. Here is how we built a planner that picks the smallest safe build, cutting full builds by 40%, peak memory by 85%, and halving build delay.