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

Technology · en

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

Cloudflare Blog · Official source · Nov 2, 2026, 2:00 PM UTC

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.