When the goal is to search for an on-disk file do you really want a network transaction out to a 3rd party to occur every single time?In cities, at least, broadband has reached such a level of penetration that this is an almost irrelevant concern except for privacy reasons. Heck, Chrome has sent out queries on an (amortized) *keystroke-by-keystroke* basis for years: complaints have been minimal, and all of them that I've seen have been privacy-related, not bandwidth- or efficiency-related.
Bandwidth these days is more than high enough that even rural satellite broadband users just won't notice this (as long as it's done asynchronously). Heck, I work from home over the Internet and have never once blown my pathetic 4Gb/month bandwidth cap despite basically living on the net. What blows caps is not incidental usage like this but things like iplayer, youtube, and bittorrent streaming.
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