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Hello, I'm new to this forum and honestly to configuring networks.
I recently bought a WR-941HP router because my house is relatively big (170 square meters) and my old router didn't have enough signal strength.

Think of my house as an L where the bottom right corner is where my router is located (my living room, where most of my wired things are), and my room is on the at the higher spot on the L, the signal on my network is suposedly very strong, but for some reason the connection is reaaaally slow, when I'm at my living room, my speed test is around 40MB download, and 5MB upload, when I'm at my room, it's 05, MB and 02MB or something like that, sometimes 5MB download but nothing higher than that, the weird part is that even the router settings are slow (192.168.1.1 admin panel).

I'm thinking maybe my router should be placer in an specific way? Not sure but this signal difference is very weird in my opinion, specially since this router is supposed to cover a lot more than my house radius.

Any help please?