The first thing you'll want to test is if the VPN is the cause of your slow connection. It's very common for speeds to dimish during peak times, but VPN's also aren't really meant for speed. So try this. Next time you started seeing slow speeds disconnect from the VPN and test your comcast connection.
The ingenious way one customer got Comcast to address his Feb 03, 2016 Very slow internet behind ASA5505 - Cisco Community Re: Very slow internet behind ASA5505 My biggest issue with an ISP that has you remove all of the network and connect 1 pc directly to this cable/dsl modem is that is not a realistic test of how the Internet service will perform for the client with a network and users behind it. West Seattle Blog… | Topic: Comcast – Very slow?
VERY SLOW INTERNET SPEED | AT&T Community Forums
Comcast offers cable television, internet and home phone service. Services are branded Xfinity in areas where digital triple play services are available. Xfinity TV offers television over the internet (IPTV). Comcast serves homes and businesses in 40 states and the District of Columbia. Comcast is a majority shareholder of NBC Universal.
Jun 14, 2017
Slow Computer Troubleshooting. Learn how to troubleshoot a slow computer. Q&A: Why are my Comcast Internet download speeds so slow? Jun 30, 2020 Why Is My Internet So Slow? - How-To Geek