1. A computer-implemented method for high performance advertisement serving by exploiting processor thread assignments in a processor having multiple threads, the method comprising: receiving, in memory, at least two digital advertisements, an instance of the digital advertisement corresponding to a plurality of decision trees, evaluation of a decision tree resulting in a tree score; determining, from the processor, a number of cores within the processor; iteratively assigning, to a next one of the number of cores, a next decision tree to calculate the tree score; and iteratively accumulating a plurality of the tree scores to form a tree score subtotal, wherein iteratively accumulating a plurality of tree scores to form a tree score subtotal terminates when the tree score subtotal is greater than a tree score subtotal threshold, based in part on an execution rate assessment.