Nailing down the exact reasons for the drop in the performance is challenging. "I am on the Microsoft file systems team and am investigating this issue," said the first comment.Īnother user reported more severe issues, with "4K IOPS write down by 7 times," using the popular CrystalMark benchmarking tool. The problem was reported on Reddit at least three months ago, before the official launch of Windows 11 in October, with a user showing that on a 4K 64 thread write test, measuring the ability to write 64 4K files in parallel, Window 10 reported 1,600MB/s but Windows 11 could only manage 91MB/s. NVMe (Non-Volatile Memory Express) is storage protocol that uses PCIe (PCI Express) to connect to the CPU, with more than twice the bandwidth of SATA interfaces and support for multiple I/O queues. Samsung NVMe SSD drives are among those reported to be slow on Windows 11
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