Quick tip on rendering in background - cycles

When I want to render in cycles fast I use my GPU but then my computer is a bit useless for other things like browsing or watching video tutorial because all the display resources are used up. So I just let the CPU do the rendering and set the thread count down to maybe 6. That way I have 2 other cores to use to work on another project in another instance of Blender. (the render cannot be paused) This frees up the GPU for my viewport shading and anything else. Cheers