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According to hwtests, older versions of IOS are slower at performing various filesystem operations: https://docs.google.com/spreadsheets/d/1OKo9IUuKCrniz4m0kYIaMP_qFtOCmAzHZ_zAmobvBcc/edit (courtesy of JMC) A quick glance at IOS9 reveals that older versions of IOS have a simplistic implementation of memcpy that does not optimize large copies by copying 16 bytes or 32 bytes per chunk, which makes cached reads and writes noticeably slower -- the difference was significant enough that the OoT speedrunning community noticed that IOS9 (the IOS that is used for the OoT VC title) was slower.