Pgoodwin1,
Thanks for the thoughts and suggestions.
Unfortunately, this is a "senior" apartment complex. I'm the youngest bear here and I'm 73. The cubs are grand-kids who visit now and then to watch my 65in Roku TV. They think its almost as good as the local theater, until the Roku STARTS TO BUFFER! Ergo, my frustration over broadband speeds. I don't really want to wake up those older grizzlys to start a revolutionary movement against the landlord and/or Comcast. Prefer to see if I can resolve my issues without involving them. I know the landlord wont budge on anything contradictory to their established paradigms anyway. They have a sign outside their office that simply says "NO".
Also, If I switch my laptop over to wi-fi, I see about half a dozen other residents on the list of available (all secured) wi-fi spots. Which confirms that most residents have been here so long they may not even know what "internet" means. Can't tell from the list who or where the small number of internet users might be.
I am on wired ethernet into my own router connected to my own modem (one "approved" by regional Comcast office) connected to a Comcast standard wall plate cable service plug. All wires, no wi-fi. I actually have 3 appliances connected to the same router: Acer laptop with Win10 OS; Roku Tv with built-in streamer; Magic Jack VoiP telephone adapter (land line). I am not connected to any complex-wide equipment or internet service in any way. EXCEPT that the cable wire coming out of the wall is obviously from some common branching within the complex i.e. its hardly likely coming directly from a comcast wire up on a pole or whatever.
My brand-new out-of-the-box modem is a D-Link model DCM-301, which Comcast have said is approved for 100mbps service; in fact I bought it because it is on a list of approved internet cable modems on their support site. Also, for whatever that interaction is worth, I phoned Comcast yesterday while installing the modem and they confirmed it is "supported" for 100mbps.
My SEPARATE older (maybe 4 years) network/wifi router is a Belkin Wireless Router Model F5D7234-4 v4...any lightbulb thoughts on that? I have been assuming that routers dont really care how fast the broadband coming from the modem is...? If there is substantial technical proof that I need a new router, I will consider buying one...
I live in Oregon. When I do flash-type speed tests, they usually ping Portland, OR. about 100 miles away from me.
I'm pretty sure there is no overwhelming internet in this complex; however, I'm on the edge of a very busy college town (University of Oregon- go ducks!) so I would not be surprised if this is a high-traffic area for broadband. And I did see in the Xfinity contract boiler-plate a mention that they reserve the right to lessen service to specific users on a selective basis when demand on the broadband is too high. So, to me that means Comcast can just cut my speed based on an undisclosed selection process like maybe because I have my own equipment, not renting it from them.
The final answer may be as simple as that. And there is no fix. But I sure would like to hear more of your ideas and suggestions on the matter. The cubs will be visiting tomorrow (Sunday) and it would be nice if I could keep up my appearance of an intelligent grandfather with them. :>