If your Windows Computer has started inexplicably loading slowly then the issue might be your Firewall. Especially if the software insisted on you updating it recently. It seems like these days updating software is like Russian roulette if you don’t have the most up to date operating system. I’ve noticed over the years that eventually an update of the Firewall will result in Windows programs loading a lot slower than usual. Sometimes it’s just one program clogging everything up because the Firewall suddenly has an issue that it’s not telling you about. Even if it’s listed as a trusted program.
At that point you usually can’t reclaim the old Firewall software so all you can do is switch to a new one. I volley back, and forth between the handful of third party Firewalls available for download on the internet. Ironically I end up using the Firewalls that caused issues in the past after a decent amount of time. No doubt some update eventually fixed the issue as I download the latest version. Simply installing a different brand of Firewall may be the solution to your slow loading Windows system, or other issues, if nothing else seems to work. If the third party Firewall applications aren’t working for you then go back to the default Windows Firewall.
An internet router acts as a hardware firewall in comparison to a software firewall that installs directly on your computer. If you only have a router, and no firewall on your computer then the router may be the issues. This might mean buying a new router. If you have both installed then disable your software to try just the router, and then connect directly to your internet connection without the router while leaving your firewall software activated so see if it’s one or the other causing Windows to load like a snail.