Object.create() creates no closure. You've already paid for in the context in which you're .create()-ing. In any case, performance optimization is what happens

Object.create() creates no closure. You've already paid for in the context in which you're .create()-ing. In any case, performance optimization is what happens when something becomes common enough to work its way into benchmarks. And calling out a delta now that's probably not your bottleneck seems...um...less than useful.