P99 0 ms* autocomplete for 240M domain names

Wirewiki.com achieves near-instant autocomplete for 240 million domain names by prefetching suggestions for the next possible character while the user is still pressing a key, then rendering results on key release. The technique achieves p99 latency of 0 ms—meaning 99% of the time results are ready before the user releases the key—by combining client-side caching with a sufficiently fast API that can deliver results within the time window between consecutive keystrokes.