why is factorio useing so much gpu power on the map screen

[its a me]

I was trying to have factorio on the map screen to reduce load on my GPU so my laptop wont over heat but it seems to make no difference and i'm having trouble understanding why it would be because you don't actually need to render any of the textures of the machines or any other entity

[Stringweasel]

Because now you're probably rendering the entire factory. This still takes a lot of time, even at lower resolution.

If you want to reduce render time then go to map screen and zoom in in the black uncharted areas so that's there's nothing to draw on screen. And maybe turn off all the overlays.