if I mount network folder as drive - I get 6 mb/s upload/download
IF I go to server via explorer (\\IP) - I get 60 mb/s upload/download
IF I go to server via explorer (\\name) - I get 6 mb/s upload/download
It sounds like you have a DNS/Network problem with the remote PC, since the DSS server would know nothing of your use of Hostname vs. IP address -- all the traffic to DSS is delivered using IP address references only.