Well this is a video posted by prime in you tube where he plays in classic mode at the Crimea Arena. If I am not mistaken classic mode was/is designed for old computers as it has a bare bones graphic engine providing better fps in vintage PCs (can you imagine what it would do in a state of the art gaming rig?)https://www.youtube.com/watch?v=Ph_xKbE0qww
This is the explanation that prime gave to soemone asking about to upgrade his computer to play the EG game as the rest of us do.
I had one of the best gaming pc ...intel i7 processor,latest vid card,lots gig of ram....the only reason a play classic cuzz the EG freezes (trees,maps) above 15k or so...about tanks battle prefer not talk about it. Wbs need to upgrade the graphics badly.
Is that an honest answer? I will leave it to you to judge
PS: I just posted this because someone did open the door for this information to come out.