Internet is super slow we have 1200 mbps

Please start here if you wish;

https://forums.xfinity.com/conversations/your-home-network/connection-troubleshooting-tips/602da777c5375f08cdea3db9 

Hello user_34j965, I really appreciate you taking the time to try that reset and for letting me know what you've done so far. Slow speeds are never fun to deal with, so I can only imagine what you've been going through. Let's get on the same page and go over a few clarifying questions to set up our next steps. Are you seeing the slow speeds over a wired, wireless, or both types of connections? Also, are you using a standalone/personal router along with your modem or gateway? 

@user_34j965 

Have you had a chance to see if any of those tips apply ?