What. You guys think those pictures are fake?
Actually, it seems the two who think they're fake are novice scripters. It's okay to not know how they work.
Also, to answer some questions:
1) Yes, they're emitters. Emitters are 2D particles, so there's no huge polycount.
2) They're emitters that stretch and curve themselves dynamically to simulate a wire's appearance.
3) No, they do not obey the physics engine. Unless they would by default, I didn't add support.
4) Maxxuss and I didn't lag when we had a bunch of giant wires up during testing.