The Post-Redis Architecture: Inside KiviDB's 21-Million-Operation Rust Engine KiviDB reports 21.2 million pipelined operations per second from a Rust engine that combines a sharded shared-nothing runtime with native HNSW vector search, positioning it as a departure from the single-threaded event loop used by classical in-memory caches. KiviDB frames the design as a response to the multi-core scaling limits and licensing fractures of those caches, including Redis. The architecture matters for teams running high-throughput in-memory data stores alongside vector search workloads. Tackling the multi-core scaling limits and licensing fractures of classical in-memory caches, KiviDB clocks 21.2 million pipelined operations per second. By unifying a sharded shared-nothing Rust runtime with native HNSW vector search, it marks a decisive departure from the single-threaded event loop.