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I doubt that exactly that will work. There are tens of thousands of different UAs (maybe 100K). Perhaps some kind of tiny (few CPU cache lines) cache for most popular UAs could help. But again: measure, measure, measure :)

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Publish your test set and I can look at it :)

I'm afraid I can't do that because of proprietary data. I think I can come up with analogous tests using open data. I'll let you know ;)

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