Can anyone tell me if there is a difference between a stone furnace vs an iron furnace, utility wise, other than just its aesthetics and the materials needed to make it?
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This should enlighten you. 
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And this is also valuable, and should be still up to date for the current live version.
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Thanks. Guess I will be mass farming Peaty Soil and Compact Peat.
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I typically try to do the same and use my coal for spark in my spark core. 
So, I now have a stone furnace and an iron furnace side by side but they don’t show any difference in speed. Both still at 1.0x.
As the pictures from @Karokendo show in that link, you won’t see a difference in speed multiplier, but the actual time should be less. And that is for a Titanium Furnace compared to a Stone Furnace. I’m not sure there’s any difference between Iron and Stone Furnaces. Keep in mind the game is pre-alpha so things might not be showing properly in this regard.
ok… thx much for the info.
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To further clarify, the speed multiplier comes from the fuel used in the Furnace, as is shown in the other link I gave.
iron furnace with 1 compact peat will cook 1 meat for 40 sec, titanium furnace - 30 sec
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Looks like I have to work towards getting me some titanium.
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I just triend compact peat in an iron furnance, the speed is 0.6x.
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Yeah but the speed difference is about 3 seconds, to 10 seconds. If you’re offline, cooking with pest won’t be noticeable.
Use a titanium furnace and it balances it out too
But it give 2 cycles, it’s more efficient.
In the furnaces i use only peat, and all the coal that i have i burn it in the power cores
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