how to make Visual Basic download a file faster {help}

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VB

I'm using the following code for download:

Dim wc As System.Net.WebClient
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
wc = New System.Net.WebClient()
wc.DownloadFileAsync(New Uri("URL"), "C:\")

I have good internet connection and the Direct link transfer rate 500.385 kb/sec on Internet Download Manager.
So how can I make download faster in VB?
It's really slow in VB

Any code?

thanks :)