tl;dr: Cloudflare reduced memory usage in its Pingora Backend Router by optimizing the consistent hashing implementation in pingora-ketama, which was consuming excessive RAM due to dozens of hash rings needed for different feature combinations. Two changes drove the savings: packing the Point struct from 8 to 6 bytes by shrinking the server index to 16 bits (25% reduction), and cutting hashes-per-server by 90% after math showed diminishing returns and 32-bit hash collisions actually worsened distribution at high counts. The migration was rolled out gradually per-datacenter to avoid cache invalidation, ultimately reclaiming 100TB of RAM globally.