Slow download speed

Linux-User, hello there and thanks for reaching out. I understand your concerns and for all the troublseshooting you've already, that really helps narrow things down. Since you're getting your full speed on the windows device, the connection from Xfinity to your home looks to be working properly, which usually points to something specific with the Linux setup rather compatibility with Xfinity service itself (we don't restrict or limit speeds based on operating system). The slower speeds on both Wi0Fi and Ethernet suggest it could be related to network drivers, adaper settings, or how the Linux distro is hanfdling your hardware. I'd recommend checking for updated kernel drivers, verifying your network adapter configuration (like duplex/speed settings), and possibly test with a live Linux USB to rule out the OS-level issues. If you'd like we can run some troubleshooting steps to see if anything on our ends appears to be in question.