Ran some more tests and I think the problem is with how Widows 10 manages H2TestW. I think what’s happening is Windows is constraining the preformance of application to last for the remaining battery life of the Surface Pro. When I just try to transfer 900 GB of data from a network drive to the MicroSD card the write speed is relatively constant at around 65MB/s. Try running the test with PowerMode set to Best performance and your device not running on battery power.
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