minecraft is in the last snapshot rely slow the ticks are so slow
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Lag is not a bug. Optimization will come after features.

Same for me 14w25b and after (here 14w26c).
Minecraft Player isn't slow, I can to run fast, use inventory fast, etc. BUT, mobs, redstone clocks, hoppers, thrownpotions, mobs movements, mobs hurt reactions, arrows, ... are very slow in a certain areas, this problem is independant against FPS (Frame per seconds).
Before 14w25, Minecraft runs perfectly.
try lowering your usage its mostly because of its new the snapshot is unstable-ish