Zilliz CTO: semantic cache adds 0.27-0.79s decision latency to requests
No_Engineer_1224 · reddit · 2026-11-06
James Luan, CTO of Zilliz (Milvus), on the hidden cost of semantic caching: a cheap reuse decision still adds a synchronous step to the request critical path. His measurements: Jev's remote API had 0.79s median decision latency including network/queueing; Laya running locally on an M4 Pro hit 0.27s. Whether it's worth it depends on comparing that wait against the generation avoided — a short fast-model response differs from a reasoning task producing thousands of tokens. Both reuse quality and decision latency belong in the evaluation; figures describe his setups, not a universal ranking.
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