"Smelting Frequencies (Smelt items every N smelting ticks)": {
"global": 1,

i try 0.5 without succes
1 is the lower we can get?

Yes. Sure you can use something like 0, -1, etc But you'd better change Speed Multipliers.

with 0  ->    DivideByZeroException: Attempted to divide by zero.


thx misticos

Sure as I have said you can but it is a bad idea