I have a 100mbps ethernet internet connection connected to a ASA5510. My Cisco VPN Clients complain about very poor performance. I get great speed test speeds. MTU on the ASA is set to 1500. I have the "crypto ipsec df-bit clear-df outside" command enabled also. I cannot get more than 3mbps up when copying files to my house. Tried from multiple internet connections and have the same problem. Any ideas?