My Obelisk (0:45, 87 parts, no crashes):
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ajH0Y=
I don't think anyone can make it faster.
I think the game would benefit from added scoring and metrics for your solution. We have run time and part count. I'd like to see metrics on smashed parts or wasted resources. And perhaps a combined rating like "dollars profit over 1 month". The game might even attempt to determine separate measurements for latency and continuous production rate.
This allows those so inclined to set their own goals and rules, yet doesn't make the game less accessible to those who are struggling to complete the levels.
This game borrows (openly) more from Manufactoid than from Manufactoria or Codex of Alchemical Engineering. Manufactoid is by the author of Codex, but is lesser known, probably because it's not a browser game. It allowed program code to be written in a language called Lua to coordinate factory operation.
Czech Flag in 0:42 with 70 parts:
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 "Tile Factory"){kind=icon}