|I installed Comodo's Firewall and during installation I accepted to install the Secure DNS too. Afterward I noticed my web-pages loaded slower than usual. They weren't extremely slow but definitely slower than what I've been accustomed.|
The above statement makes it rather obvious the "Commode" software you installed is responsible for "slowing" down your web page loading.
The key to troubleshooting this is the fact that after you installed this software, your web page loading slowed down and it was working fine before you installed said software.
If it were me, I'd uninstall the application (Windows actually has a built in firewall that works pretty well AND it won't slow down your web page loading.......keeping in mind, your SOHO Router also has a firewall up and running between you and the internet) and reset my DNS settings on the router back to what they were.
If you're messed them up too badly, reset the router to factory defaults and reconfigure it.
DNS is pretty basic. It either works or it doesn't. I've never seen DNS break halfway and begin loading pages slowly. It either works and pages load, or it doesn't work and they don't load....there's no "in between" here.
The real problem you're now having is this "secure DNS" that's part of the software you installed and I wager the ONLY way to get rid of it is to uninstall that firewall.
It matters not how straight the gate,
How charged with punishments the scroll,
I am the master of my fate;
I am the captain of my soul.