I am a xfinifty customer for long time.
I just upgraded to xfinity 100mbps and my speed is 80mbps
Do you have any scripts that will run for example you specify how often ( hourly, daily, weekly, monthly) to monitor the internet speed using xfinity speed test and store the results in a file so you either send to Xfinity support.
Also I have noticed I have to reset my cable modem once every 2 week where the speeds drop to 10 to 15mpbs.
I look forward to hearing from you.