AllocationDeciders (plural) currently take all the AllocationDecider instances in a set. While the order does not matter for a "yes" decision (because it must be unanimous), a "no" or "throttle" decision could be optimized if cheaper deciders were allowed to run first.

Adding a weight, with a default of 1.0 (easy since AllocationDecider is an abstract class), would allow expensive deciders to increase their weight and run later.