Zero latency autocomplete for 240 M domains: Wirewiki hits p99 0 ms
Wirewiki’s autocomplete prefetches and caches suggestions while the user types, then queries an API that combines an in‑memory trie for the top‑1 M domains with a memory‑mapped SSD block index for the remaining 240 M. This hybrid design trims end‑to‑end latency to under 121 ms, meaning 99 % of results appear before the key is released.