In addition to my other comments about parallel IO and unbuffered IO, be aware t... | Hacker News

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		mgerdts 4 days ago \| parent \| context \| favorite \| on: Copy-Item is slower than File Explorer In addition to my other comments about parallel IO and unbuffered IO, be aware that WS2022 has (had?) a rather slow NVMe driver. It has been improved in WS2025.

jiggawatts 4 days ago [–]

I just benchmarked this to death using a 24-core VM with two different kinds of NVMe storage.

Windows Server 2025 is somewhat better on reads but only at low parallelism.

There’s no difference on writes.

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