Temporary Console very slow

[Hypernut]

Issue Description

The temporary console is very slow compared to the "normal" integrated console.
I don't now if that is a new issue or known, I did not use the temp-console until recently.

Running the following code:

(Measure-command {
    $List = New-Object System.Collections.Generic.List[object]
    for ($i = 1; $i -le 50000; $i++) {
            $Obj =  New-Object Psobject -Property ([ORDERED]@{
            A = $i*223231
            B = $i*4345353
        })
        $List.add($obj)
    }
}).totalSeconds

Takes:
Integrated Console: 4,4 Seconds
Temporary Integrated Console: 76,1 Seconds

I have tried the latest preview of the extension, same result.

Attached Logs

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Environment Information

Visual Studio Code

Name	Version
Operating System	Windows_NT x64 10.0.17134
VSCode	1.45.1
PowerShell Extension Version	2020.4.0

PowerShell Information

Name	Value
PSVersion	5.1.17134.858
PSEdition	Desktop
PSCompatibleVersions	1.0 2.0 3.0 4.0 5.0 5.1.17134.858
BuildVersion	10.0.17134.858
CLRVersion	4.0.30319.42000
WSManStackVersion	3.0
PSRemotingProtocolVersion	2.3
SerializationVersion	1.1.0.1

Visual Studio Code Extensions

Visual Studio Code Extensions(Click to Expand)

Extension	Author	Version
ayu	teabyii	0.18.0
Bookmarks	alefragnani	11.2.0
code-runner	formulahendry	0.10.0
markdown-preview-enhanced	shd101wyy	0.5.10
material-icon-theme	PKief	4.1.0
material-theme	zhuangtongfa	3.7.1
particle-vscode-theme	particle	1.12.0
php-debug	felixfbecker	1.13.0
php-intellisense	felixfbecker	2.3.14
powershell	ms-vscode	2020.4.0
powershell-preview	ms-vscode	2020.6.0
python	ms-python	2020.5.80290
python-preview	dongli	0.0.4
vscode-ipython	pancho111203	0.5.0
vscode-language-babel	mgmcdermott	0.0.27
xml	DotJoshJohnson	2.5.0

[SydneyhSmith]

Thanks @Hypernut this could be because of the cacheing that occurs in the integrated console that does not in the temporary...does this repro in a fresh start of VSCode (making the integrated console as "fresh" as the temporary console)?

[Hypernut]

Yes it does.

[Hypernut]

But it seems the issue is more complicated than just "normal console" vs. "temp console".
When running the code via the debugger, it is slow no matter what.
Copying the code into a console and runnng it, results in the times posted above.

And btw. the slowness is not limited to any kind of specific code, I created the example above because I noticed all my script ran considerably slower in VSC than ISE or the standalone console.

[ili101]

But it seems the issue is more complicated than just "normal console" vs. "temp console".
When running

The Windows 10 + Debugger + PowerShell 5.1 is a different known bug PowerShell/PowerShell#10269
You can upgrade to PowerShell 7 to workaround as it doesn't look like the fix is going to be back ported to PS 5 any time soon

[Hypernut]

Could be. But an upgrade to v7 is out of the question. We have huge repositories of scripts running all over the place. This would take weeks, even months of compatibility testing to get this (maybe) approved.

Update: I just realized that the bug you linked is a year old. If the security fix that caused that, was rolled out a year ago as well, than this cant be the problem, because we would have felt the effect earlier.

[ghost]

This issue is being closed as inactive, if this issue is still occurring it will be re-opened