[General Maximus]

that's telling you that you are physically receiving 1gbit to your property and the shub. The speed reduction and problem lies within your network and your own equipment after the shub so you need to be looking at network cables, the nics on your client and the throughput on any intermediate switches and routers.

As an example, I knew my old Asus router would max out at 740mbits so I bought a new one which gives me 940+.