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Wake Them Up

• does one room per cycle and suspends once the cell is fully woken up.
  
• continues when the size increases (when new rooms are loaded). The trick is: the size never decreases.
  
• as a primary consequence: the peak cost is only one room's cost. (instead of many as it occures a lot that many pop in one cycle) => that's what reduces / removes the stutters.
  
• as a consequence: each room is only requested once. (instead of constantly)
  
• as a consequence: long time server runs bigroom list is not a problem as the room list is never parsed.
  
• Mimic Vanilla behaviour to avoid spawning Zombies in the player's spawning building.
  
• Mimic Vanilla behaviour to avoid spawning Zombies in specific 'empty' rooms.

• Spawning zombies faster than vanilla will increase the CPU load. So you have to choose between that CPU cost increase and the risk of last second zombie spawn as described in the video.

• Credits to Ducks for the initial solution: Ducks' Zombie Building Spawn Fix.
  
• Picture comes from this video's miniature. Credits to the author for pointing out the problem.

On Lockdown[theindiestone.com]
This mod cannot be modified by anyone else, for anything else, at all, ever. Even if the user disappears, he or she would much rather you didn't touch the fruits of their hard labour.