1. A computer-implemented method for efficiently processing a large number of records, the method comprising: obtaining, by a computer system, a plurality of records; obtaining, by the computer system, a decision tree; processing, by the computer system, the plurality of records through the decision tree; and the processing comprising arriving at a distinction node of the decision tree, the distinction node corresponding to a distinction requiring completion of an as yet uncomputed computation, completing, by the computer system after the arriving, the computation, and making the distinction based on results of the computation.