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How well does this perform compared to your postgreSQL example?

Also - We are looking for a Ruby / Backbone.js developer drop me an email josh@seriousfox.co.uk :)

Thanks for you comment Josh. In production I actually implemented PG version and it's still in use today. I thought it will scale better and last longer. I didn't do benchmarking or anything like that - it think it would really depend on size of you dataset. For something serious - compute recommendation in background and store them in database. I believe that is how "big boys" do it. :)

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