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1000 items processed in 4.66 secs (535 with a score > 0.2)
1000 items processed in 1.554 secs (411 with a score > 0.2)
Macbook 2.3 GHz Intel Core i5, 4 GB 1333 DDR3.
So, node.js is 3x faster, but have to work on accuracy. I'll try to think on that :)