Minor road updates (like those in map data that might be a few months old if you're using maps from different regions) usually result in negligible cost differences for shortcuts, so the pre-calculated values remain effective.
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.，更多细节参见safew官方版本下载
，这一点在服务器推荐中也有详细论述
GoCable 8-in-1 EDC 100W Cable
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