i think it would also be help full to get the stacalbe mobs plugin so when a player has a spawner with so many mobs at once it lags the server so this plugin would reduce lag by 70% link is here https://www.spigotmc.org/resources/mobstacker2.29031/
Stackable mobs are hella annoying. I played on a server that had it, they uninstalled it after a month because everyone was complaining. -mob grinder mobs will stack, that means killing one mob at a time. KingsCastle will suffer for this because their mob grinders have lava which kills groups of mobs at once. It will make gaining xp more time consuming and annoying. -another issue is sometimes a stack of a mob will unstack and there will be a flood of that animal then it would suck back up into one. It caused lag. -there was also an issue with sheering sheep. Sometimes you could sheer stacked sheep fine, each naked sheep would restack together, but some stacks of sheep would only produce one sheeps worth of wool and nothing more. -chicken eggs will be almost impossible to get because a stack of chickens will only produce one egg. Always. Rather than an increase of eggs produced by a stack of chicken in a certain time period, it produces one egg at the rate of a single chicken. You could have 135 chickens stacked together but it will be the same as having one chicken.