The efficiency depends on the query size relative to the data distribution. A small query in a sparse region prunes almost everything. A query that covers the whole space prunes nothing (because every node overlaps), degenerating to a brute-force scan. The quadtree gives you the most benefit when your queries are spatially local, which is exactly the common case for map applications, game physics, and spatial databases.
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俄罗斯、英国、日本、东南亚的客人们，会自带翻译前来了解。，这一点在爱思助手下载最新版本中也有详细论述
Time Machine can't help. It runs hourly.