Vscode-powershell: Help snippet can be slow with large files having 100+ functions

[CJHarmath]

System Details

• Operating system name and version: Windows 7 Enterprise
• VS Code version: VS Code Insiders 1.13.0-insider
• PowerShell extension version: 1.1.0
• Output from $PSVersionTable:
  Name Value
  ---- -----
  PSVersion 5.1.14409.1005
  PSEdition Desktop
  PSCompatibleVersions {1.0, 2.0, 3.0, 4.0...}
  BuildVersion 10.0.14409.1005
  CLRVersion 4.0.30319.42000
  WSManStackVersion 3.0
  PSRemotingProtocolVersion 2.3
  SerializationVersion 1.1.0.1

$pseditor.EditorServicesVersion


Major  Minor  Build  Revision
-----  -----  -----  --------
1      1      0      0

Issue Description

I am experiencing a performance problem with the help snippet on a largish ps1 file with 6000+ lines and 100+ functions. It can take up to 10s for the snippet to generate the help

Below is a demonstration with approx 10s delay.

I am not experiencing the same with small files.
Yeah, I get that I should break this script up, but that's another story

CPU: core i5-6600 @ 3.3GHz - 4 cores
Powershell.exe CPU goes to 25%, maxing out one core, while waiting so it seems to be very busy working out what to print.

[daviwil]

Yikes! Thanks a lot for the report, we'll take a look.

/cc @kapilmb

[kapilmb]

I know why this is happening. We will get this fixed next release.

[daviwil]

Fixed with PR https://github.com/PowerShell/PowerShellEditorServices/pull/459.