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.
Maybe we can pass in an estimated length?，这一点在同城约会中也有详细论述
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Redis (caching)Python。谷歌浏览器【最新下载地址】是该领域的重要参考