In one of the 1.8 snapshots, there is a very annoying problem for the
superflat players. The game will suffering high latency (in case you
don't know, Singleplayer is run in internal server). This problem cause
all the mob became slow responding and more harder to kill. It affect
the mob loot dropping time and block dropping time. Fortunately, it
doesn't affect block mining much. This problem is caused by large amount
of slimes in superflat world.



Here is the way to fix it.

Go and set dirt level to level 55 (Note the value must be more than 40).

If you do it correctly, it should look like this.

That's all, you should notice the high latecy will be gone in your superflat world.


How this trick fix the lag?
It is pretty simple, the slie can only spawn between level 0 - 40. Spawn very frequently in superflat between level 0-40 because of very flat space. So, if I set the world to level 41 and above, the slimes will not able to spawn in our world.