Your measured speed is limited by whatever bottlenecks exist between you and Xfinity’s servers. To solve your problem you need to run some tests to find what is limiting your speed. Some possible bottlenecks:
1) problems with the incoming Xfinity cable or signal
2) problems with the xfinity modem/router
3) problems with the connectors or cable between wall and the xfinity modem
4) problems with your router, router cable or router setup (if you have one)
5) problems with the device doing the speed test
6) other problems like speedtest domain’s, VPN’s, dns resolvers etc
I use Speedtest by OOKLA. It works well for me. So, i would suggest checking results from that
If you have spare cables, swap them out first and test again because this is the easiest thing to do.
Next, if you have a laptop ( or desktop), then turnoff the wifi on your laptop and use an ethernet cable to connect your laptop to the xfinity ethernet port. Then run your speedtest.
If your speed is still very low, then the wifi is not the limiting factor… try connecting a different device and run the test again. If the results are still bad then its either the ethrnet cable, the xfinity modem or their incoming signal
if your speed is good on the ethernet connection, then it is something in your wifi setup. You can sort this out by trying speedtest using two different devices (like recent ipads, iphones, samsung phones .. because these have good wifi receivers)
I have xfinity cable (300 mbs speed) and use their grey modem with my 2018 Asus router. I consistently get 250 mbs downloads while using VPN everywhere in my 2000 sq ft home and lanai. Uploads are typically 10 or 11 (which is what Xfinity promises)
But i did have an internet issue for 24 hours about two months ago. I determined that it seemed to be either the xfinity modem or their signal. I took the modem back to xfinity and swapped it. That fixed the problem (Well it was a little more complicated … when i arrived home i found the new modem they gave me had a rattle sound like a loose screw and had to return it for another). No issues since then
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