I thought at first that it was the fault of my main computer (I have a collapsed C drive and the drives in photoshop I had to set to two others by what I thought was the cause) But it turned out otherwise.
The issue started to appear on my second - work - computer. Which has completely different specifications. So what hardware the program is used on is completely irrelevant - whether high end or low end.
The issue is like this - that Photoshop 2018 starts to go unimaginably slow after 10 minutes or so of not working in it (that is, even as I search for photos in the database). It is impossible to upload a photo to it. It is impossible to open a new project, because it takes an eternity. It can't handle basic actions like selecting or moving the screen. Everything goes SLOW. When closing a window, the program completely crashes. Sometimes after launching it is not even displayed in the task manager. On one and the other computer it works on.
Replies such as - install the latest version - will immediately be ignored - I use this one - because it suits me best and is not loaded with unnecessary options that further overload the system, and performance and speed are a key condition for me.
I suspect that it may be the fault of some Windows update, because until yesterday I thought it was the drivers, but when I reinstalled them nothing changed - still after 10 minutes it is impossible to work, and the problem occurred today on the second machine.
Reinstalling the program with system tools and adobe cleaner - nothing worked. Reinstalling the drivers also did not give anything. Changing the settings - also gave nothing.