Provided is a performance optimization system that can identify a case where the impact on performance is large even when the number of cache misses is small. The substrate comprises a base and a stack of layers of base and its ellipsometric properties are known. The liquid stops flowing to the toilet bowl when the flexible ringed hose goes back to its original vertical position when the pull on the wire is released and when the level of the liquid inside the tank is below the top opening of the flexible ringed hose. The first and second rubber grommets have chamfered ends to facilitate push-in insertion into the apertures, and the first and second rubber grommets each have a central opening to receive headed attachment rods therein. At least one of the load flank lead and the stab flank lead, on at least one of the female member and the male member, is changed at a predetermined rate beginning at a selected distance from an end of the threads.