$Results = @()

$ToCheck = @(2,4,8,16,32,64,128,256,512,1024,2048,4096,8192,16384,32768)
foreach ($Iterations in $ToCheck) {
    $Results+= Measure-Command -Expression { 
        $PSArray = @{}
        for ($i=0; $i -lt $Iterations; $i++) {
            $PSArray += @{$I.ToString()=$I}
        }
    }
    $Iterations
}

$Results = @()

$ToCheck = @(2,4,8,16,32,64,128,256,512,1024,2048,4096,8192,16384,32768)
foreach ($Iterations in $ToCheck) {
    $Results+= Measure-Command -Expression { 
        $PSArray = [System.Collections.Generic.Dictionary[string,int]]::new()
        for ($i=0; $i -lt $Iterations; $i++) {
            $PSArray.Add($I.ToString(), $I)
        }
    }
    $Iterations
}

$Results = @()

$ToCheck = @(2,4,8,16,32,64,128,256,512,1024,2048,4096,8192,16384,32768)
foreach ($Iterations in $ToCheck) {
    $Results+= Measure-Command -Expression { 
        $PSArray = @{}
        for ($i=0; $i -lt $Iterations; $i++) {
            $PSArray.Add($I.ToString(),$I)
        }
    }
    $Iterations
}