Speedy PowerShell file search on Windows

Search-Filename.ps1

<#
.Synopsis
   Performs a basic filename search throughout a directory
.DESCRIPTION
   Performs a basic filename search throughout a directory and returns matching file names
.EXAMPLE
   Search-Filename -Path "C:\Windows\System32" -Pattern "*.dll"
.EXAMPLE
   Search-Filename "document.txt" -Recurse
#>

function Search-Filename
{
    param(
        [Parameter(Mandatory=$false)]
        [ValidateScript({Test-Path -Path $_ -PathType Container})]
        [string]
        $Path = ".\",

        [Parameter(Mandatory=$true,Position=0)]
        [string]
        $Pattern,

        [Parameter(Mandatory=$false)]
        [switch]
        $Recurse
    )

    if($Recurse)
    {
        $SearchOption = [System.IO.SearchOption]::AllDirectories
    }
    else
    {
        $SearchOption = [System.IO.SearchOption]::TopDirectoryOnly
    }

    $IllegalChars = [char[]]'^\/:"<>|'

    foreach($c in ([char[]]$Pattern))
    {
        if($IllegalChars -contains $c)
        {
            throw [System.IO.IOException]"$Pattern contains illegal character $c"
            return $false
        }
    }

    $Directory = Get-Item -Path $Path

    try{
        [System.IO.Directory]::GetFiles($Directory.FullName,$Pattern,$SearchOption)
    }
    catch{
        Write-Error $_
    }
}

I have experimented with a similar approach to speed up searching for files and folders in PowerShell, but I had to abandon this approach, as it fails when it hits a folder it can't read. And it just fails, it won't continue :( I have managed to code around it, but by then the speed was actually worse than just using Get-ChildItem.

Yes, this implementation suffers from that as well :( ... I might try something like this: https://social.msdn.microsoft.com/Forums/vstudio/en-US/ae61e5a6-97f9-4eaa-9f1a-856541c6dcce/directorygetfiles-gives-me-access-denied (The Stack example)