So someone showed me this clip from id_'s stream:

He has the graphics turned down to a picmip 5 kind of style and for some reason only he has access to this hidden feature at the moment?

Because afaik I haven't seen any other streamers play with this hidden feature.

It looks pretty nice though and it makes the game for people with low end machines more fps friendly i guess.

I can't wait for this feature/option to be implemented in a future update.