And it was even worse back in the day when computers barely had any RAM and basically relied completely on the swap file to do multitasking. You'd be in a game, accidentally hit the windows key, then you'd have to wait like a full minute or more for it to swap your game memory out so it could swap your other desktop apps back in, only to then have to wait again for it to swap that stuff back out to get back into the game. And all of this was happening on a hard drive.

And during this whole process, there was a moderate chance that individual applications or your entire system would crash.

Even the mode change for the display would take more time.