Part 1: Rethinking Cache Purge, Fast and Scalable Global Cache Invalidation

What this post added

This post details the engineering challenges and current performance benchmarks of Cloudflare's global cache purge system. It breaks down the difficulties in achieving scale, speed, and precise scope for cache invalidation. The post then benchmarks the existing purge pipeline across various regions and purge types (URL vs. others), providing P50, P75, and P99 latency figures in seconds for different regions and global averages. This serves as a baseline analysis for future improvements to the purge system.