How to avoid using import-csv for huge sized files. Currently I am using System.IO.File . Can someone share some lights with clear understanding of Get-content vs System.IO.StreamReader.

[System.IO.File]::OpenText('big.txt') | ForEach-Object {
    $line = $_.ReadLine()
    if ($null -eq $line) { $_.Dispose(); break }
    # process $line
}