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I installed an openVPN server on my dedicated server on ubuntu server 12.04. Both my server and my current connection are on optic fiber.

I tested server bandwidth: upload 50mbit / download 88mbit

my home bandwith : upload 60mbit / download 96 mbit

But, when I connect to my vpn my average download speed on the same file is 8mbit

The server is brand new, it contains nothing except openvpn, fail2ban, and sometimes a minecraft server. I obviously tested openVPN when disabling everything. When I download from my computer using VPN, the server CPU is only at 27% and memory is fine too so it's not a performance problem..

I followed this tutorial (which is in french but every methods are visible) : http://my1.fr/blog/creer-son-serveur-vpn-sous-debian/

Any idea ?

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How are you testing your bandwidth? Did you use something like iperf to test from yoour client to your VPN server? –  Zoredache Jan 25 '13 at 17:25
    
I download with curl the same linux iso which is sent at least at 10Mb/s. For the upload I used SFTP. –  xenom Jan 25 '13 at 19:03

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