If you transfer a large file between two PCs or two storage devices on your network while hardwired, what are your LAN speeds? Do you get a transfer rate of over 100 MBps (800 Mbps)?
When I upgraded to Spectrum Gig last summer, my 4 year old Cisco SMB router could not handle it. I'd max out at around 600 Mbps on speed tests. I bought it's direct replacement and instantly I was at 930+, most of the time hitting between 940 and 950. Fastest I ever hit was 980. I didn't put much effort into trying to track down the issue, since I was thinking about upgrading the router anyway. There can be other factors that limit your WAN speeds, at least you narrowed it down to the router. Could it be a setting? Sure. I would make sure you have the latest firmware and then call the manufacture, could be some QoS setting. One thing I would do is disconnect all devices from your network except for the PC you are testing with to eliminate the possibility of other devices consuming bandwidth. Unlikely you'd have a constant stream of 150 Mbps outbound, but anythings possible. Did you make many modifications to the router? If so, did you happen to do a test when you first hooked it up prior to any changes being made? When I swap out networking hardware at work I always do a test in the out of the box state and then do another one after all customizations have been made just to make sure I don't inadvertently click something and to make sure the changes don't have a negative impact on performance.
