If your program does 1/1000 of the GPU work Overwatch does every frame, it will cost in the order of magnitude of 1/1000 of what Overwatch costs to render (some fixed costs aside) -- taking aside the fact that you also don't need to re-render the entire window every vblank.

i mean, sometimes it feels like it does

VRAM isn't RAM. Unless your postman is rendering 3D objects.

Yes yes I know that. Do I really need to post a sarcasm tag.

Ngl, the joke didn't land for me.

well that's fine, it's not a great joke, but perhaps think, does me explaining that vram and ram are different things make a difference to what this person is saying? Is this person saying anything that would be fundamentally altered by me pointing out the mistake they're making? sometimes just ignore comments and let them die the death they deserve