iphone 7 had this. think iphone 8 have "problem"? pricier model can write data @ 341 mbps, while cheaper cousin can achieve 42 mbps. https://www.tomsguide.com/us/iphone-7-32-slower,news-23701.html quote
in benchmarking test, hilsentenger found iphone 7 models smallest , largest amounts of storage have similar storage read speeds — 686 mbps 32gb, 856 mbps 256gb — write speeds drastically different. (that's megabytes per second, not megabits per second, if wondering.) pricier model can write data @ 341 mbps, while cheaper cousin can achieve 42 mbps. that’s eight-fold difference, in case low-end iphone calculator taking long math.
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that's pretty standard solid state drives (ssd). think of 256gb 4x 64gb in raid-0. mask allocating 5-30gb of pseudo-slc cache once run out of cache, goes regular steady state performance. day day use, won't notice difference between 32gb or higher capacity models.
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