pgvector vs numpy on 100k vectors: exact scan is 5x slower, HNSW is 7x faster
On 100k x 384 vectors, numpy exact search took 7.2 ms, pgvector without an index 37 ms, and pgvector HNSW 1.0 ms at 0.955 recall@10. Measured on 2 vCPUs.
6 Nov 2026 · pgvector · vector-search