Can you please give us some more details about your local network?
It doesn’t matter so much how much data is coming in through your ISP from the outside.
Much more decisive is how much throughput your local network can achieve, while your 1000MB Download internet is the underlying technology that enables its connectivity.
So, how is your core machine connected?
If not hardwired to the router or an unmanaged switch via ethernet cable, but via cable with a wifi extender, that could explain the problems. Hardwired to a wifi extender or access point is still wifi.
Another option, have you tested your cables, could it be that one of them is broken?
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