I thought bladetraps were fast. But, the rocket launcher kills zombies faster. I think it might be bugged, so the rockets don't hurt the player. Or maybe i'm perked so high i don't take explosive damage. Whatever, it blew my mind.
Warning: Some say rockets do damage them. Seems related to a multiplayer pvp setting, i use no killing as default in my single player world. At any rate, this video is a showoff. Won't find 100 zombies piled up that nicely in the real game. Maybe in a horde pit, but there, rockets are fine. Rockets are most likely too expansive for killing single zombies in a real game too.
Didn't use the fps counter, and it had a noticeable framerate drop, but not to unplayable levels even with OBS recording, even with...