Starting as early as at least 2022-10-26, users may experience a significant performance degradation when enabling HTTP/3 on their sites. Users are advised to disable HTTP/3 for better performance.
Update: Improvements have been made to HTTP/3 performance recently that greatly reduce the impact of this regression.
Additionally, Cache Reserve operations were failing which may have resulted in increased cache misses for customers using LHR as an upper tier. Standard CDN is unaffected. We will continue to monitor the impact and update.
Posted Feb 13, 2025 - 04:23 UTC
Monitoring
A fix has been implemented and we are monitoring the results.
Posted Feb 13, 2025 - 03:18 UTC
Investigating
Cloudflare is aware of, and investigating, an issue which potentially impacts users in London using public resolver . Further details will be provided as more information becomes available.
Posted Feb 13, 2025 - 02:52 UTC
This incident affected: Cloudflare Sites and Services (Cache Reserve, Recursive DNS).