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When the input is unsorted, all the rest of the loop takes substantial time. But with sorted input, the processor is somehow able to spend not just less time in the body of the loop, meaning the buckets at offsets 0x18 and 0x1C, but vanishingly little time on the mechanism of looping.
Author is trying to discuss profiling in the context of code posted here and in the process trying to explain why the sorted case is so much more faster.