Minecraft wiki entry for Door-based_iron_golem_farming, associated text: Description: Although this design consists of multiple regular Iron Golem spawning platforms, the way that each of these spawning platforms is arranged makes the design as efficient as possible. This design is best suited for laggy multiplayer servers or servers that have the mobstack plugin. In TheBurntPhoenix's video, he has built a total of 12 spawning platforms separated into 3 layers, with 4 on each layer. Each platform on a single layer is 64 blocks away from each other, and is vertically 100 blocks away from each layer in order to optimize the rate that iron golems are spawned on slower servers. The bridges sends the newly spawned iron golems away from the spawning area, which allows more iron golems to be spawned without the issue of them being stacked together on servers with Mobstack. This way, the killing process will be much more efficient, allowing more iron to be obtained.