- _dedup_embeddings: pre-allocated (Q,D) buffer replaces vstack-on-keep, dropping O(K²×D) copy overhead down to O(K×D) fill work - _kmedoids: swap cost sum replaced with numpy fancy-index reduction, ~20-50x faster per swap evaluation - _reconcile_frigate_mappings: O(L) load/save pairs collapsed to one batch write via record_frigate_files_batch