After building up a mob elevator and a killing floor (2x2 piston floor with 2 lava sources. limited redstone) single player works fine but as soon as a second player joins in via split screen, MC lags horribly and this is local play only. Issue is specific to the area around the mob elevator i had this setup originally with stone fences to make it not look like just a big square tower but after reading others lag issues I removed all the stone fences and rebuilt with cobblestone blocks. Lag isn't as bad after the changes but it's still there enough to be a constant annoyance. . I doubt I can build much else in the area with out making it pitifully slow again. really sucks since the area is still fairly basic right now and i haven't done anything really complex short of the mob elevator (water blocks and signs, no redstone or pistons in the elevator) even the elevator in my opinion is extremely simplistic in design.
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