Manticore HNSW Gets 29% KNN Throughput Gain via AVX-512 and 2-Pass Search

Three optimizations to Manticore Search's HNSW core — a 2-pass neighbor traversal, batched distance computation, and AVX-512 SIMD distance functions — deliver up to 29% higher KNN throughput at high k values and 20%+ gains under concurrent load. Changes require no API updates, index rebuilds, or config changes. Drop-in performance improvement for existing Manticore deployments.