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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As part of their research, they have put together a set of proposed improvements for Node.js' Web streams implementation that will eliminate promises in certain code paths which can yield a significant performance boost up to 10x faster, which only goes to prove the point: promises, while useful, add significant overhead. As one of the core maintainers of Node.js, I am looking forward to helping Malte and the folks at Vercel get their proposed improvements landed!