How fast is federated search?

Yesterday I received an email from a reader of this blog asking if I knew of any performance benchmarks for federated search engines. I replied, telling the reader that I would address the question in this blog. Here’s my reply:

I’m not aware of any benchmark studies and even if I were I’d be very suspicious of their findings because there are too many variables that determine performance of federated search engines. These questions come to mind:

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