I've hosted the dedicated server and connected to it from the same machine and It does get VERY laggy, sometimes crashing.
I'm running an i5-4690K quad core at 3.5GHz, NVIDIA GeForce GTX 760 3GB, and 8GB of system RAM.
The dedicated server uses around 3GB and the client starts off around 2 and ends up about 4 after 15mins or so. This is usually when it starts to lag, freeze, and crash.
However I've never had lag issues playing offline or hosting a...