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Merged
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May 26, 2025
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5/26/2025 PM Publish #12109

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12 changes: 9 additions & 3 deletions ...e/docs-conceptual/dev-cross-plat/performance/script-authoring-considerations.md
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Expand Up @@ -113,6 +113,11 @@ $results += Get-SomethingElse
$results
```

>[!NOTE]
> In PowerShell 7.5, array addition was optimized and no longer creates a new array for each
> operation. The performance considerations described here still apply to PowerShell versions
> prior to 7.5. For more information, see [What's New in PowerShell 7.5][01].

Array addition is inefficient because arrays have a fixed size. Each addition to the array creates
a new array big enough to hold all elements of both the left and right operands. The elements of
both operands are copied into the new array. For small collections, this overhead may not matter.
Expand Down Expand Up @@ -880,21 +885,22 @@ Iterations Test TotalMilliseconds RelativeSpeed
- [Add-Member][18]

<!-- Link reference definitions -->
[01]: ../../whats-new/what-s-new-in-powershell-75.md#engine-improvements
[02]: ../../learn/deep-dives/everything-about-hashtable.md
[03]: ../../learn/deep-dives/everything-about-null.md
[04]: xref:System.Void
[05]: xref:Microsoft.PowerShell.Core.Out-Null
[06]: xref:System.Collections.Generic.List`1
[07]: xref:System.Collections.Generic.List`1.Add*
[07]: xref:System.Collections.Generic.List`1.Add%2A
[08]: xref:System.String
[09]: xref:System.Int32
[10]: xref:System.Object
[11]: xref:System.Collections.Generic.List`1.ToArray*#system-collections-generic-list-1-toarray
[11]: xref:System.Collections.Generic.List%601.ToArray%2A#system-collections-generic-list-1-toarray
[12]: xref:System.Collections.ArrayList
[13]: /powershell/module/microsoft.powershell.core/about/about_join
[14]: xref:System.Text.StringBuilder
[15]: xref:System.IO.StreamReader
[16]: xref:System.IO.File.ReadLines*
[16]: xref:System.IO.File.ReadLines%2A
[17]: xref:Microsoft.PowerShell.Utility.Write-Host
[18]: xref:Microsoft.PowerShell.Utility.Add-Member
[19]: /powershell/module/microsoft.powershell.core/about/about_hash_tables#creating-ordered-dictionaries