Lava spreads to quickly.

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Note that, in the Nether, lava spreads like water.

He might be talking about another glitch in the overworld where lava sometimes spreads two blocks long instantly, but that might just be caused by lag.

Oh thanks! it happened in the nether, i was unaware that lava did that in the nether.

@Aaron Rhodes

That's not lag, that's caused by random ticks, it's intended.