This is honestly a hard one for me to diagnose. From what I can tell, if it's just your PC that is slow, while everything else is fine, then it's probably that your computer has a bad wifi connection, the lan cord you're using is faulty, the lan port on your computer could be fitting incorrectly to your lan cord, or your computer itself could have a hardware problem that doesn't allow it to connect to the internet correctly.
Alternatively, have you checked your firewall? Toribash might be blocked. If you're using a VPN, I'd suggest disabling it and checking then.