When i modify the multiplier , it does not change anything at all ! i already tried so many things since yesterday and still nothing.
(i even deleted the Furnace Splitter plugings).
Please help. 

Here is what's inside the JSON file:

{
  "Use Permission": false,
  "Speed Multipliers": {
    "global": 1.0,
    "furnace": 20.0
  },
  "Fuel Usage Speed Multipliers": {
    "global": 1.0,
    "furnace": 20.0
  },
  "Fuel Usage Multipliers": {
    "global": 1.0,
    "furnace": 20.0
  },
  "Output Multipliers": {
    "global": {
      "global": 1.0
    },
    "furnace.shortname": {
      "item.shortname": 1.0
    }
  },
  "Whitelist": {
    "global": [
      "item.shortname"
    ],
    "furnace.shortname": [
      "item.shortname"
    ]
  },
  "Blacklist": {
    "global": [
      "item.shortname"
    ],
    "furnace.shortname": [
      "item.shortname"
    ]
  },
  "Smelting Frequencies (Smelt items every N smelting ticks)": {
    "global": 1,
    "furnace.shortname": 1
  },
  "Debug": false
}