MobStackerSystem [1.20 - 1.21]
1.0.0High-performance mob stacking with per-chunk limits and full drop support.
MobStacker is an ultra-fast
extremely stable and highly optimized mob stacking system for Paper/Pufferfish 1.21+.
It keeps the full vanilla feeling 
normal drops, normal XP, normal animations
while reducing mob lag in every chunk to an absolute minimum 
Features
• Supports all living and spawnable mobs
• Per-mob configuration in mobstacker.json
• Adjustable maximum stack size
• Adjustable maximum mob count per chunk
• 100% vanilla drops and XP
• Clean stack-down behavior when killing mobs (10x → 9x → …)
• Automatic unstacking when config values change
• Fully customizable name tags
• Name tags only visible when players are in the chunk or have line of sight
• World blacklist for full control
Performance
• Highly optimized chunk mob calculations
• Extremely low CPU usage
• Efficient name-tag update intervals
• No duplication bugs, no missing drops, no exploits
• No console spam
• Minimal RAM usage
• Perfect for servers with 100+ players
Benefits
• Significantly reduced lag in farms and spawn-heavy areas
• Stable TPS even with many mobs
• Players feel no difference – full vanilla gameplay preserved
Config
{
"maxStackSize" : 16,
"maxChunkMobs" : 100,
"displayFormat" : "§7{name} §a{amount}§7x",
"mobs" : {
"ALLAY" : true,
"ARMADILLO" : true,
"ARMOR_STAND" : true,
"AXOLOTL" : true,
"BAT" : true,
"BEE" : true,
"BLAZE" : true,
"BOGGED" : true,
"BREEZE" : true,
"CAMEL" : true,
"CAT" : true,
"CAVE_SPIDER" : true,
"CHICKEN" : true,
"COD" : true,
"COW" : true,
"CREAKING" : true,
"CREEPER" : true,
"DOLPHIN" : true,
"DONKEY" : true,
"DROWNED" : true,
"ELDER_GUARDIAN" : true,
"ENDER_DRAGON" : true,
"ENDERMAN" : true,
"ENDERMITE" : true,
"EVOKER" : true,
"FOX" : true,
"FROG" : true,
"GHAST" : true,
"GIANT" : true,
"GLOW_SQUID" : true,
"GOAT" : true,
"GUARDIAN" : true,
"HAPPY_GHAST" : true,
"HOGLIN" : true,
"HORSE" : true,
"HUSK" : true,
"ILLUSIONER" : true,
"IRON_GOLEM" : true,
"LLAMA" : true,
"MAGMA_CUBE" : true,
"MOOSHROOM" : true,
"MULE" : true,
"OCELOT" : true,
"PANDA" : true,
"PARROT" : true,
"PHANTOM" : true,
"PIG" : true,
"PIGLIN" : true,
"PIGLIN_BRUTE" : true,
"PILLAGER" : true,
"POLAR_BEAR" : true,
"PUFFERFISH" : true,
"RABBIT" : true,
"RAVAGER" : true,
"SALMON" : true,
"SHEEP" : true,
"SHULKER" : true,
"SILVERFISH" : true,
"SKELETON" : true,
"SKELETON_HORSE" : true,
"SLIME" : true,
"SNIFFER" : true,
"SNOW_GOLEM" : true,
"SPIDER" : true,
"SQUID" : true,
"STRAY" : true,
"STRIDER" : true,
"TADPOLE" : true,
"TRADER_LLAMA" : true,
"TROPICAL_FISH" : true,
"TURTLE" : true,
"VEX" : true,
"VILLAGER" : true,
"VINDICATOR" : true,
"WANDERING_TRADER" : true,
"WARDEN" : true,
"WITCH" : true,
"WITHER" : true,
"WITHER_SKELETON" : true,
"WOLF" : true,
"ZOGLIN" : true,
"ZOMBIE" : true,
"ZOMBIE_HORSE" : true,
"ZOMBIE_VILLAGER" : true,
"ZOMBIFIED_PIGLIN" : true
},
"worldBlacklistEnabled" : false,
"worldBlacklist" : [ ],
"nameTagUpdateIntervalTicks" : 60,
"partialNameTagUpdates" : true,
"useLineOfSightForNameTags" : true,
"useChunkMobCountCache" : true
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