@piet dang, I had hoped that I would be buying you the box of beer and enjoying a twice as fast codec );

This is why I'm advocating the approach of bipf (though that module is just a proof of concept) the trick here is don't create new javascript objects. This enables you to filter without creating objects at all. Mostly, you read something from the database, look at a couple of values, pass it to another place, and probably reserialize it again to the network. But with an in-place format, you can skip both parsing and serializing. You only parse the properties you look at!