@jockoe
The wireless router (not the modem) may not have the same signal at all locations throughout a residence, particularly if you have a single router or access point. There are several things that can make a difference, including the wiring within the walls, electronics in the room, distance from the router, nearby networks (yes, a totally separate network can interfere with your network), and other things.
You may not like this, but if your connection speed is enough to stream without buffering, then you gain nothing from increasing that speed. Amazon, for instance, recommends 15 Mbps for 4K/UHD streaming. Netflix says 25 Mbps. If your device speed is that or higher, getting it even higher brings nothing to the table.
That's not to say that you couldn't increase it with some work, but if the work involves re-wiring your house, it's probably not worth it. But it's your time and your money.
@jockoe wrote:
... Should the IP address of both of my Roku devices be identical? (They are different) ...
No. You're looking at your internal IP address. Externally, they're all the same because it's actually your network's IP address that the Internet sees. Internally, your router in routing all the traffic (that's why they call it a router) to the devices based on the internal IP address. Devices are assigned an address when they connect to the network (and not before). Each is unique within that network, and that's how the router knows where to route the traffic. Two devices cannot have the same IP address on a network.
DBDukes
Roku Community Streaming Expert
Note: I am not a Roku employee.
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