Redirect Standard Output Efficiently in .NET

I am trying to call php-cgi.exe from a .NET program. I use RedirectStandardOutput to get the output back as a stream but the whole thing is very slow.

Do you have any idea on how I can make that faster? Any other technique?

    Dim oCGI As ProcessStartInfo = New ProcessStartInfo()
    oCGI.WorkingDirectory = "C:\Program Files\Application\php"
    oCGI.FileName = "php-cgi.exe"
    oCGI.RedirectStandardOutput = True
    oCGI.RedirectStandardInput = True
    oCGI.UseShellExecute = False
    oCGI.CreateNoWindow = True

    Dim oProcess As Process = New Process()

    oProcess.StartInfo = oCGI
    oProcess.Start()

    oProcess.StandardOutput.ReadToEnd()