Because it starts rendering the minute i click on the node and it is only a small window.
I would like to be able to choose when i want to see the preview, i want to be able to disable it and then just use the show in new window from the shader window.
I only have a 2 core cpu and if the shader preview is rendering and the rendering preview, well then the system is pretty busy.
Of course now i am using the workaround which means clicking on another category (example...camera.) then the window goes away.