now sure what I am doing wrong

{
  "Use Permission": false,
  "Speed Multipliers": {
    "global": 2.0,
    "furnace": 1.0,
    "furnace.large": 1.0,
    "electricfurnace.deployed": 1.0,
    "refinery_small_deployed": 1.0,
    "campfire": 1.0,
    "bbq.deployed": 1.0,
    "hobobarrel.deployed": 1.0,
    "fireplace.deployed": 1.0,
    "legacy_furnace": 1.0,
    "cursedcauldron.deployed": 1.0,
    "skull_fire_pit": 1.0,
    "lantern.deployed": 1.0,
    "tunalight.deployed": 1.0,
    "chineselantern_white.deployed": 1.0,
    "chineselantern.deployed": 1.0,
    "jackolantern.angry": 1.0,
    "jackolantern.happy": 1.0
    
  },
  "Fuel Usage Speed Multipliers": {
    "global": 1.0,
    "furnace": 1.0,
    "furnace.large": 1.0,
    "electricfurnace.deployed": 1.0,
    "refinery_small_deployed": 1.0,
    "campfire": 1.0,
    "bbq.deployed": 1.0,
    "hobobarrel.deployed": 1.0,
    "fireplace.deployed": 1.0,
    "legacy_furnace": 1.0,
    "cursedcauldron.deployed": 1.0,
    "skull_fire_pit": 1.0,
    "lantern.deployed": 1.0,
    "tunalight.deployed": 1.0,
    "chineselantern_white.deployed": 1.0,
    "chineselantern.deployed": 1.0,
    "jackolantern.angry": 1.0,
    "jackolantern.happy": 1.0
  },
  "Fuel Usage Multipliers": {
    "global": 1,
    "furnace": 1.0,
    "furnace.large": 1.0,
    "electricfurnace.deployed": 1.0,
    "refinery_small_deployed": 1.0,
    "campfire": 1.0,
    "bbq.deployed": 1.0,
    "hobobarrel.deployed": 1.0,
    "fireplace.deployed": 1.0,
    "legacy_furnace": 1.0,
    "cursedcauldron.deployed": 1.0,
    "skull_fire_pit": 1.0,
    "lantern.deployed": 1.0,
    "tunalight.deployed": 1.0,
    "chineselantern_white.deployed": 1.0,
    "chineselantern.deployed": 1.0,
    "jackolantern.angry": 1.0,
    "jackolantern.happy": 1.0
  },
  "Output Multipliers": {
    "global": {
      "global": 1.0
    },
    "furnace.shortname": {
      "item.shortname": 1.0
    }
  },
  "Whitelist": {
    "global": [],
    "furnace.shortname": []
  },
  "Blacklist": {
    "global": [],
    "furnace.shortname": []
  },
  "Smelting Frequencies (Smelt items every N smelting ticks)": {
    "global": 1,
    "furnace.shortname": 1
  },
  "Debug": false
}

Hello! "Fuel Usage Multipliers" only supports integers (e.g. 1 and 2, NOT 1.0 or 2.0)

Thank you for that catch!

I had another question now, it seems like my electric furnaces are still operating at their normal speed? Can you confirm how I am suppose to increase its speed? it the shortname ' electric.furnace ' or ' electricfurnace.deployed ' ? or do you know what i am doing wrong?