SMB (fileshare) is slow / capped to 10Mbit

Open powershell as administrator:

Set-SmbClientConfiguration -EnableBandwidthThrottling 0 -EnableLargeMtu 1

Read more: 

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\LanmanWorkstation\Parameters

EnableSecuritySignature → should be 0

RequireSecuritySignature → should be 0