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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Kimmel goes on to suggest that rather than subpoenaing Clinton to testify "they could bring in someone who actually knew him, someone who Epstein called his 'closest friend', someone who said he was a 'terrific guy' who 'likes beautiful women...on the younger side'."