But even when I am hardlined into the modem with my PC, it doesn't change anything (getting the same speedtest results). My PC is using a wired connection with a CAT6 cable to the router, which in turn is connected to the modem with a CAT6 cable. Sometimes lower, sometimes higher (like I just did it and got 500, but then tested again and got 220). However, ALL of my devices have the same issue: Whenever I run a speedtest with ANY of my devices (connected directly into the modem, or the router's LAN port, or via the router's wifi) with either Ookla or Xfinity speed tests, the speed starts FAST initially, showing 750-920 mbps (which is what I expect), but after 2-3 seconds, the speed begins to taper down and completes at 250-300 mbps. So the technician concluded that it must be my device's fault. When he connected his tester to my router, he showed he was able to pull in a full 950-980 Mbps through the router. This did improve my download speeds a small amount. He had me tweak some ethernet controller settings (in particular I changed my "Speed & Duplex" from "Auto Negotiate" to "1.0 Gbps Full Duplex"). Spent a lot of time with customer service, and a second technician just left my home. And wouldn't you know it? It DIDN'T fix the issue! (still using the TP-Link router) I have now purchased a Netgear Nighthawk CM-1200 (DOCSIS 3.1) modem. But the phone tech, as well as the in-person tech said it was the modem, and that replacing it would fix the issue.
I was previously getting good speeds on the modem, so I didn't think it was the modem. At that time (which was just 4-5 days ago), I was using a TP-Link TC-7620 (DOCSIS 3.0) modem, with a TP-Link AC1900 wifi router. I called Comcast and they reported to me that everything seemed to be fine on their end, and blamed my modem. In troubleshooting this, I did a speedtest, and found that I am getting 250-300 mbps on my main device, rather than the 800mbps that I pay for with Comcast Xfinity. Luckily, you can try the following steps in a sequence to resolve the problem.I have noticed that my zoom call quality has been subpar lately. Sometimes, an outdated OS, temporary junk files, and an unstable WiFi connection is the root cause of the upload speed issue on Xfinity. But, first, here are the three conventional methods that you can try to increase Xfinity upload speed. We’ll also discuss disabling third-party firewalls for better upload speed. However, our step-by-step instructions will take you through the entire process by keeping you away from all the techy stuff. Too many devices are connected to an Xfinity network.īoosting Xfinity upload speed can be a daunting task for an average user.There can be multiple reasons for slow upload speed. Method #4: Disabling Third-Party Firewalls.Why Is My Xfinity Upload Speed So Slow?.
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