AI Weekly Malaysia

Ruurtjan, who runs Wirewiki.com (a DNS/domain inspection tool), achieved p99 0ms perceived latency for autocomplete over 240M domain names by prefetching on keyDown: when a user presses a key, the client requests suggestions for the current query plus pre-bucketed results for every possible next character. The API response includes a 'next' map keyed by character, so by the time the user releases the key (keyUp), results for the likely next query are already cached and render instantly.

Why: If you ship any autocomplete or search-as-you-type UX, this prefetch-on-keyDown pattern lets you hide network latency entirely within the human keypress gap — you don't need edge compute or a smaller dataset, just an API that returns next-character buckets alongside current results. The tradeoff is bandwidth: each request returns up to 36 extra suggestion lists, so evaluate whether your payload size stays acceptable.