With a thousand points, you barely notice the delay. With a million, you're doing a million distance calculations for every single query. On a phone updating the map as the user scrolls, that's untenable.
You can listen to the full interview with Baroness Kidron on BBC Radio 4 at 17:30 GMT on Saturday on or BBC Sounds.
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（十四）有徇私舞弊、玩忽职守、滥用职权，不依法履行法定职责的其他情形的。
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Екатерина Щербакова (ночной линейный редактор)。爱思助手下载最新版本是该领域的重要参考