I'm getting a max of around 15Mbps using both SSL Site-to-site VPNs and the client based VPN.
I have an Sophos UTM 320 and would expect much higher throughput. Our connection is in a datacentre with a gigabit internet connection.
HTTP and FTP traffic scales up to 100's of MBps on the same connection, but the max I can get is 15 on the SSL VPN.
I've seen in here that UDP can make a difference, but I cannot change this unfortunately.
Details:
TCP 443
AES-256-CBC
Compression off (although turning on doesn't improve things)
CPU/memory usage is low.
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