XFi wired connection slower than wifi

Same for me.  My Wifi is smoking fast, up to my plan speed of 275mb download.....however the wire connections to PC's is only 80mb or so.  I do not see any response from Xfinity regarding your post. Ugh!

I am having the same issue. I can get 600+ Mbps on WiFi, however via wired connection I top out at 300 Mbps... but mainly in the range of 220-280 Mbps. Any new info on how to fix?

You are absolutely correct that every household is different. The problem is that WiFi speeds are faster than wired in our situation... which should never be the case. Achieving speeds of 200+ Mbps on wired, it is clear the network is negotiating at above 100Mbps... so there should be no reason, assuming cables and network card drivers are current, to not achieve the speed one is paying for on a direct wired connection.

Thanks...I feel the same way.  If your Ethernet Adapter is GB capable....and CAT 6 ENet cables are used.....and there is no dumb switch being used that might be limited to 10/100 mb........It appears that the physical ENet ports on the back of the XFi are the issue......or the XFi might have settings internally that limit the speed on these ports. I currently have my PC connected directly to the XFi.....and still only getting 60-80 mbps download speeds on any given day.....(plan speed is 275mbps) on multiple PC's that I have tested.   I will call Xfinity to discuss. I'll bet they tell me to upgrade to 600 mbps......if I want 200mbps.  I'm ready for a fight !  I can't believe that Wifi could have greater (more dependable) speeds than a gb wired connection.

It could very well be being held back by PC hardware. 1 gig speeds take at least quad cores and a few gigabytes of RAM. I know my GF's 2500k couldn't hit the 940-950 Mbps cap and would only hit 650-660mpbs max on speedtests.

Same issue occurring in both my Xfinity locations.  Hard wired, I used to be able to get pretty close to plan speeds.  Lately, with the Xfinity modem hot spot I can get close to 300Mbs, but Enet only about 40.  The Enet Adapter on my laptop has negotiated a GBit connection, and connected directly to the Xfinity device, I should be getting much better results.  Unfortunately, this impacts my downstream routers too.  I think it's a contrived situation to reduce performance of 3rd party routers and try to get customers to rent Xfinity repeater pods

This is so freakin annoying.  I'm having the exact same issue.  Supposed to be 1Gb speed and it's only coming in around 100Mbps.  But wifi is cranking at 300+.  So exhausted with customer service.  Zero help.

This is still a consistent problem. It actually wasn't an issue on the black router/modem but on the new white one it is. I have two different laptops that I can confirm the exact behavior on. Before the modem change, I was getting 850Mbps plus speeds over ethernet and 350-400Mbps wireless. After the modem change I have the literal exact reverse which is typically fine but because I game online, the wired connection provides better stability but now with the lower speed while wired, it's kind of boggling my mind. A tech even came out and verified the behavior. He even tried a new modem (same white model I had received the week before to replace the black one) because he thought that maybe it was defective. After setup we experienced the exact same issue but after swapping around some cables I was suddenly getting great speeds while wired. However, that literally only lasted until he left my house. It was as if there's something triggering the ethernet ports on the router/modem to throttle down or maybe use the 2GHz band or something. Unfortunately the troubleshooting tools available to customers are quite limited so I don't have a clean way to confirm. At my house I do also have a TP Link Decco star network setup for extending the wireless network through the house. I have an ethernet cable that goes from the Xfiniti modem to the master Decco router (2 feet away). From the Decco master I have ethernet back to a 1Gb switch in my mechanical room. From there, I have ethernet directly out to the two child Decco routers elsewhere in the house. I have no idea if the Decco mesh is triggering the router/modem to change it's routing rules and drop down to 2GHz that the Decco Mesh network supports both 2GHz and 5GHz bands so it doesn't make a lot of sense all around. Anyway, super frustrating and like I said, the older, black modem/router never had this issue with all the exact same hardware I've been using.