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My ISP uses fiber to local substations and then uses the cable network (copper-based) for providing service in the apartments - currently they are able to push 2Gbps down / 100Mbps up using these old-ass coaxial cables and in a densely populated area, which is pretty impressive if taking into account that the city started building that network in a public/private partnership, and originally just used for TV (even getting an upstream in those networks was pretty tricky IIRC and wasn't viable in the beginning) in the late 80s - my first connection from them was 300kbps, and that was blazing fast for the time!
If it's traffic shaping, you might try to find out. I looked around, and you can either try using wireshark to see if something fishy is going on, or you might try https://github.com/marcelscode/glasnost , but that tool is pretty old and i don't know how reliable it is nowadays. At least it's java based, so it should run anyways.
Edit: I just saw you mentioned that you were just using 20Mbps. There's no way that has any impact even when on a shared medium for other users in you area, so that theory can be canned.
Nonetheless, this is a great opportunity for me to read up on traffic shaping! Thanks!
And, wow, 2 Gbps down on a coaxial? Sick! Maybe that's all the bandwidth freed up from people not watching cable television anymore? ๐คฃ