Poor Network Performance from VPN sites

We are experiencing poor network performance when connecting from hardware VPN sites. VPN sites have Cisco Hardware VPN client 3002 which terminates to Cisco 3005 VPN concentrator. Geting upload/download speeds of 355/484kbsp from VPN to surewest.com. If I remove the VPN and connect laptop directly to dsl modem, speeds are 3mb up and 1mb down. Any ideas what could be causing this?

Try this
Adjust the MTU and MSS size in concentrator and client.
Try these link for more info:
http://www.cisco.com/en/US/products/hw/vpndevc/ps2284/products_configuration_guide_chapter09186a008015ce0e.html#1223423
http://www.cisco.com/en/US/products/hw/vpndevc/ps2286/products_user_guide_chapter09186a00803ef6c5.html

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