I just tried to open the context menu in Windows Explorer. It showed up almost as soon as I released the mouse button, and I have a much slower CPU, older video card, and way less RAM then you do. I was also running 12 windows of Firefox with collectively 1000+ tabs (though only about 36 or loaded), Steam, a Unity game, and Microsoft Teams, plus a number of background programs.
If your Explorer context menu is taking more than a split second to load, there's something wrong with your hardware.
Other than hardware it could also be some third-party software hooking into Explorer to do who knows what.
There must be something wrong with quite a lot of hardware then. My windows laptop at work took > 20 seconds to open the right-click menu on the desktop.
During the wait the entire desktop background went black along with the icons then it came back. I was actually trying to get to a setting to set the background to a fixed colour instead of an image in the hope of speeding the machine up.
From a UX experience there was zero indication that it was trying to do anything during this time.