Why is Observe more efficient than Tracker?

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I just noticed this comment in an OKGrow post (https://www.okgrow.com/posts/where-does-redux-fit-in-meteor)

Note that Mongo.Collection.Observe can be used instead of tracker for a more efficient and powerful solution, but Tracker is in this example to convey the idea.

I was wondering why the author says Mongo.Collection.Observe is more efficient than Tracker. I thought it was basically the same thing.

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