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    <p>I found out the <code>GetChildItem</code> is the slowest option when working with many items in a directory.</p> <p>Look at the results:</p> <pre><code>Measure-Command { Get-ChildItem C:\Windows -rec | Out-Null } TotalSeconds : 77,3730275 Measure-Command { listdir C:\Windows | Out-Null } TotalSeconds : 20,4077132 measure-command { cmd /c dir c:\windows /s /b | out-null } TotalSeconds : 13,8357157 </code></pre> <p>(with listdir function defined like this:</p> <pre><code>function listdir($dir) { $dir [system.io.directory]::GetFiles($dir) foreach ($d in [system.io.directory]::GetDirectories($dir)) { listdir $d } } </code></pre> <p>)</p> <p>With this in mind, what I would do: I would stay in PowerShell but use more lowlevel approach with .NET methods:</p> <pre><code>function DoForFirst($directory, $max, $action) { function go($dir, $options) { foreach ($f in [system.io.Directory]::EnumerateFiles($dir)) { if ($options.Remaining -le 0) { return } &amp; $action $f $options.Remaining-- } foreach ($d in [system.io.directory]::EnumerateDirectories($dir)) { if ($options.Remaining -le 0) { return } go $d $options } } go $directory (New-Object PsObject -Property @{Remaining=$max }) } doForFirst c:\windows 100 {write-host File: $args } # I use PsObject to avoid global variables and ref parameters. </code></pre> <p><em>To use the code you have to switch to .NET 4.0 runtime -- enumerating methods are new in .NET 4.0.</em> </p> <p>You can specify any scriptblock as <code>-action</code> parameter, so in your case it would be something like <code>{Move-item -literalPath $args -dest c:\dir }</code>.</p> <p>Just try to list first 1000 items, I hope it will finish very quickly:</p> <pre><code>doForFirst c:\yourdirectory 1000 {write-host '.' -nonew } </code></pre> <p>And of course you can process all items at once, just use</p> <pre><code>doForFirst c:\yourdirectory ([long]::MaxValue) {move-item ... } </code></pre> <p>and each item should be processed immediately after it is returned. So the whole list is not read at once and then processed, but it is processed during reading.</p>
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    1. POHow to split a huge folder?
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    1. CO+1 for the performance comparison!
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      1. USKai Wang
    2. COIt gets worse. At about 300000 files, the resonse time graph goes hockey-stick http://blogs.msdn.com/b/powershell/archive/2009/11/04/why-is-get-childitem-so-slow.aspx
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    3. COKeep in mind that EnumerateFiles is a new method in .NET 4.0 and not normally available to PowerShell. You must have mod'd your PowerShell config or registry to bind PowerShell to .NET 4.0.
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