Slow startup when loading one-line profile on a SSD

Powershell takes a lot of time to launch, even on my computer with an SSD disk.
It says "Loading personal and system profiles took 1031ms."
My only profile option is set at $PROFILE.AllUsersAllHosts, with a single line to disable deafening beep.
Set-PSReadlineOption -BellStyle None.
Even with the profile file deleted, powershell still takes quite a lot of time to launch, but less than with the profile.
It used to take ~600ms to launch, but it jumped to ~1s after KB4025342 .

Environment data

PS C:\Users\phg> $PSVersionTable

Name                           Value
----                           -----
PSVersion                      5.1.15063.483
PSEdition                      Desktop
PSCompatibleVersions           {1.0, 2.0, 3.0, 4.0...}
BuildVersion                   10.0.15063.483
CLRVersion                     4.0.30319.42000
WSManStackVersion              3.0
PSRemotingProtocolVersion      2.3
SerializationVersion           1.1.0.1

[SteveL-MSFT]

Can you try PSCore6? Our target is ~250ms cold startup time (excluding user profiles). I'm using build 16225 of Win10 and it took 600ms for Windows PowerShell 5.1 to startup.

@SteveL-MSFT with powershell 6 it starts up way faster than the current 5.1.15063.483 version, but it does not show message with startup time.

[SteveL-MSFT]

@pedrogarcia the startup time output only happens for Windows PowerShell currently. You can time it yourself by doing this from Windows PowerShell:

measure-command { & 'C:\Program Files\PowerShell\6.0.0-beta.3\powershell.exe' -c 1+1 }

[SteveL-MSFT]

You might also try powershell -noprofile for Windows PowerShell to eliminate any profile as a factor

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