SMB file copies 40% slower

October’s Patch Tuesday for Windows 11 22H2 introduced up to a 40% throughput loss when copying large files over SMB network shares. Enterprise provisioning packages also broke. The SMB performance regression wouldn’t be fixed until February 2023 — over four months of degraded network file transfers. Microsoft “finally fixes” was BleepingComputer’s headline when the fix arrived, emphasis on “finally.” Four months to fix making file copies slower is a pace that would make the file copies themselves look fast.