The concern is not "Community Center" help related. Topic moved here to the proper help section for assistance. 

Having your speeds accurately reflected is pretty important, so we can absolutely correct this to ensure you are getting the amazing Xfinity experience you deserve. We appreciate the additional insight on the potential root of the issue as well, however I can assure you that you would not be getting throttled. That said, there are numerous potential causes for speed related concerns. Have you already gone through the troubleshooting steps available on our Support Site?

I had the exact same conversation with an Xfinity chat rep today who had me jump through all the typical troubleshooting hoops to resolve the issue "on my end." This is very obviously an artificial cap. Why are my upstream speeds, which should be capped at 200 Mbps, so obviously capped at ~40 Mbps? If someone from Xfinity wants to chat, I'm happy to provide my ticket number.

My account says 200 but I'm still only getting 40.  The thing that's going on is Comcast is in the middle of rolling out speed upgrades.  2 weekends ago I woke up to a crashed modem.  So I reset it and the Internet came back up.  Ran a speed test, 1400/40 as usual.  Pulled up the admin page on the modem and I had an upstream OFDMA channel locked.  Hadn't seen that before.  That's when I hopped on Comcast's web site and saw that I supposedly had 1200/200.  Then I checked the approved devices page https://www.xfinity.com/support/devices/#auth, clicked the all supported devices link, looked at the .pdf and realized my Netgear CM2050V modem was the 3rd one added to the approved list for increased upload speed.  Previously the only customer owned modems approved for increased upload were the Hitron CODA and Hitron CODA56.  Comcast crashed my modem in the middle of the night again last weekend so I was hoping I'd see a speed increase, but not so far.  Eventually I'll call them up and ask or stop by the local Comcast store and ask, but as long as they're crashing my modem in the middle of the night every weekend I figure they're still working on it.  

Netgear CAX80 is not currently on the approved list for increased upload, so it'll only get 40 up or so on a 1200/35 plan.  Comcast likes to overprovision a bit.  950 down sounds like you're using 1Gb ethernet, because that's what you would get with 1Gb ethernet.  You need a 2.5Gb or faster ethernet to get more than that over a wired connection.  If your computer doesn't have 2.5Gb+ built in you can add it with a PCI-e card or a USB adapter.  My 2019 model laptop hits full speed (roughly 1400/40) with a 2.5Gb USB adapter.  If you want more upload right now you'll have to either rent an XB8 or buy a Hitron CODA56 and a router.  Maybe.  You might be in a neighborhood like mine where they haven't finished the upgrades yet.  CAX80 doesn't have phone support so I assume you don't have Comcast Voice.  Or you can just wait.  All three approved customer owned devices for increased upload are modems, not combo modem/router units.  Hitron CODA tops out at 950, CODA56 has a 2.5Gb ethernet port and can support a 1200 plan, and the Netgear CM2050V also has a 2.5Gb port but it has voice support so it's only supported if you have Comcast phone service.  Land line/IP phone, not cell phone.  All that said I expect they'll be adding more DOCSIS 3.1 devices to the approved list.

What a surprise.  I live in Houston, TX, and have EXACTLY the same numbers.  950 going down (the difference between 1200 and 950 is moot) and 40-42 going up.  They just rolled out an email stating that

Faster internet speeds now available

Upgrade your internet equipment today!

Good news
You can now enjoy up to 5-10x faster upload speeds and smoother connections with your current Xfinity Internet package.

But, still stuck on the 40 upload.  The "help" online says they will send out a technician to see what is wrong with my equipment.  I'd like to know if they read their own forums, and if so, what is wrong with them???

I have the exact same issue. Paying for 800 down, 100 up and I'm getting (according to Comcast) 950 down and 24 up. Using a Motorola MB8611 which supports up to 800 mbps up speeds, yet for some reason isn't listed as supported for the higher upload rates.

Just making a first post to follow the direct message instructions 👀

@melaniers 

Please see this post about direct messaging the support team;

https://forums.xfinity.com/conversations/getting-started/direct-message/6445fb0eb9339b2013e8ff9c?commentId=6446bf50b9339b2013e93478