I'm trying to use my 1.6TH Terraminer to solo mine altcoins. It kind of works, but the hashrate is about 900G-1T. If I mine the same coin in the pool, the rate is normal (1.5-1.6TH/s)

The coin daemon is running on another machine (VM) in the local network. The network does not seem to be busy.

Any ideas what might be the bottleneck? Anything I could tweak on cgminer side or in daemon configuration?