[Ditto]

This is more of a database interface issue than anything else.

I'm thinking search terms and connection speed.

[econjack]

I'm thinking search terms and connection speed.

That's kinda what I mean: How fast can you access the search engine and produce the results. My guess is that they already have an engine that parses the question into keywords and query on the basis of the least-common words (to minimize the return results) and then parse those results into an answer.