It turned out that in fat32 the speed exceeds 80 (as visible on the screen), and in the first few seconds on custom firmware I managed to get 100+ for writing to exfat, possibly thanks to the cache. At first, when I saw a 40 MB read write, I thought to send this Fake back. Exfat speed thus falls to around 40 or perhaps lower. Those. It's beneficial if your writing and reading speeds are each half of the claimed rate. Maybe it only happens on my phone.
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