I'm not sure what's going on with that subtest, and the lack of scaling is certainly egregious. But we've all encountered tasks that in theory could scale much better but in practice have been implemented in a more or less serial fashion. That kind of thing probably isn't a good choice for a multi-core test suite, but on the other hand: given that Geekbench has both multi-core and single-core scores for the same subtests (though with different problem sizes), it would be unrealistic if all the subtests were highly scalable. Encountering bad scalability is a frequent, everyday part of using computers.