Sorry, but that doesn’t make sense: even when I fly around I don’t have such a high (constant!) GPU usage, and the ventilators (coolers) kick in, but not as intense as just witnessed here (otherwise I wouldn’t even have noticed).
And “rendering of background image”: are you serious? We are talking about a static screenshot here, right?
Again, this is not the “hangar scene”, this is the screen which let’s me choose the package folder, shows me the update progress bar going up (pixel by pixel)… please don’t tell me that you’d expect to render a static image with some blurry dialog in the foreground to take up 100% GPU.