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I forgot to mention, that it helps to build the hoppers on chunk borders. links to some recent bug reports: https://bugs.mojang.com/browse/MC-79154 https://bugs.mojang.com/browse/MC-78155 IMPORTANT NOTES: 9/2/16 chunk loading improved in 1.9 and doesn't create enough stress anymore. You need to create lag spikes with a different method. Also some servers change the way hoppers work, duplication might not occur on them. Also servers with constantly decreased TPS aren't suitable for this method. Apart from that hopper duplication still occurs in 1.10.2 and can be exploited. world download: http://www.mediafire.com/download/roythkatf90ghzh/powerful_farm.rar