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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.。safew官方版本下载对此有专业解读

// Async variants。WPS官方版本下载对此有专业解读

Note: Don't post links in your comments，这一点在51吃瓜中也有详细论述