Extremely slow download speeds for at least the past 4 days

Nothing new, just the same slow download speeds (55-90 Mbps, depending on when I check).  I hope the tech will be able to identify the issue.

We are here for your support, @SC1615853! Please let me know if you have any questions or if you need assistance with anything else. Our amazing community is always ready to help, 24 hours a day, 7 days a week.

Technician did not show up during the service window I chose (10am-12pm).  It's 12:58pm now.  I still have extremely slow internet, I reset the modem again yesterday, still no improvement.

Hi there! We will be happy to look into this for you. Hi there! Can you initiate a direct message and start with your full name and address? To start a direct message, you must be signed in. Please click the "Direct Messaging" icon in the top right of the page next to the bell, and send your message to "Xfinity Support". Talk to you there! 

Live agent tells me it was never scheduled but I have an entire SMS text transcript with "266278" (where all my Xfinity updates and MFA auth codes are sent from) that says the service appt was scheduled for 8/23.

The rest was taken to DMs with Comcast.  In short the techs who did come out found no problems with my line or the connection inside, signals were strong and the last tech showed me the max bandwidth available over the line using a device the previous tech didn't have, which was just over 1 Gbps.  I don't know if i really needed a new modem (I had a 5 yr old DOCSIS 3.1 modem), but I did ultimately purchase a new modem that was listed as certified for "next gen" service by Xfinity (the Hitron CODA56 was the least expensive of those listed in a PDF file I found on the comcast website, sorry I don't have the link) and a new Netgear Nighthawk wifi router to replace my also 5 year old wifi router.  I am getting the advertised speeds for my subscription now.  I believe the issue was with the WAN interface on the old wifi router where it was no longer able to negotiate the correct download speed from the cable modem's ethernet ("internet") port, upload speeds were unaffected.  The new router hardware hasn't had that problem.

user_h1p65m thank you for using the Community Forums page to reach out today. Fast speeds are important in the digital world we live in today, and I am happy to ensure you are getting the best possible speeds for your existing package. A lot of potential factors can cause performance to decrease, so we definitely want to troubleshoot the connection. What troubleshooting steps have you already attempted when using the Xfinity Support troubleshooting site?