The plugin and config worked fine for a long time, and then I noticed everything was going really slow again.  When reloading, console says:

[Quick Smelt] Your configuration file contains an error. Using default configuration values.

Here is the config.  .json validator says it's fine, I can't find an issue.  

{
  "Permission": "quicksmelt.use",
  "Use Permission": false,
  "Speed Multipliers": {
    "furnace": 1.4,
    "furnace.large": 1.4,
    "refinery_small_deployed": 1.4,
    "campfire": 1.0,
    "skull_fire_pit": 1.0,
    "fireplace.deployed": 1.0,
    "bbq.deployed": 1.4
  },
  "Fuel Usage Speed Multipliers": {
    "furnace": 1.4,
    "furnace.large": 1.4,
    "refinery_small_deployed": 1.4,
    "campfire": 1.0,
    "skull_fire_pit": 1.0,
    "fireplace.deployed": 1.0,
    "bbq.deployed": 1.4
  },
  "Fuel Usage Multipliers": {
    "furnace": 1.4,
    "furnace.large": 1.4,
    "refinery_small_deployed": 1.4,
    "campfire": 1.0,
    "skull_fire_pit": 1.0,
    "fireplace.deployed": 1.0,
    "bbq.deployed": 1.4
  },
  "Output Multipliers": {
    "furnace": {
      "metal.fragments": 1.0,
      "sulfur": 1.0,
      "charcoal": 1.0,
      "metal.refined": 1.0
    },
    "furnace.large": {
      "metal.fragments": 1.0,
      "sulfur": 1.0,
      "charcoal": 1.0,
      "metal.refined": 1.0
    },
    "refinery_small_deployed": {
      "lowgradefuel": 1.0
    },
    "campfire": {
      "bearmeat.cooked": 1.0,
      "chicken.cooked": 1.0,
      "deermeat.cooked": 1.0,
      "fish.cooked": 1.0,
      "horsemeat.cooked": 1.0,
      "humanmeat.cooked": 1.0,
      "meat.pork.cooked": 1.0,
      "wolfmeat.cooked": 1.0
    },
    "skull_fire_pit": {
      "bearmeat.cooked": 1.0,
      "chicken.cooked": 1.0,
      "deermeat.cooked": 1.0,
      "fish.cooked": 1.0,
      "metal.refined": 1.0,
      "horsemeat.cooked": 1.0,
      "humanmeat.cooked": 1.0,
      "meat.pork.cooked": 1.0,
      "wolfmeat.cooked": 1.0
    },
    "fireplace.deployed": {
      "bearmeat.cooked": 1.0,
      "chicken.cooked": 1.0,
      "deermeat.cooked": 1.0,
      "fish.cooked": 1.0,
      "metal.fragments": 1.0,
      "horsemeat.cooked": 1.0,
      "humanmeat.cooked": 1.0,
      "meat.pork.cooked": 1.0,
      "wolfmeat.cooked": 1.0
    },
    "bbq.deployed": {
      "bearmeat.cooked": 1.0,
      "chicken.cooked": 1.0,
      "deermeat.cooked": 1.0,
      "fish.cooked": 1.0,
      "sulfur": 1.0,
      "horsemeat.cooked": 1.0,
      "humanmeat.cooked": 1.0,
      "meat.pork.cooked": 1.0,
      "wolfmeat.cooked": 1.0
    }
  },
  "Whitelist": {
    "furnace": [
      "metal.ore",
      "sulfur.ore",
      "hq.metal.ore",
      "can.tuna.empty",
      "can.beans.empty",
      "bearmeat",
      "chicken.raw",
      "deermeat.raw",
      "fish.raw",
      "horsemeat.raw",
      "humanmeat.raw",
      "meat.boar",
      "charcoal",
      "wolfmeat.raw",
      "crude.oil"
    ],
    "furnace.large": [
      "metal.ore",
      "sulfur.ore",
      "hq.metal.ore",
      "bearmeat",
      "chicken.raw",
      "deermeat.raw",
      "fish.raw",
      "horsemeat.raw",
      "humanmeat.raw",
      "meat.boar",
      "wolfmeat.raw",
      "can.tuna.empty",
      "can.beans.empty",
      "crude.oil"
    ],
    "small.oil.refinery": [
      "crude.oil"
    ],
    "campfire": [
      "bearmeat",
      "chicken.raw",
      "deermeat.raw",
      "fish.raw",
      "horsemeat.raw",
      "humanmeat.raw",
      "meat.boar",
      "wolfmeat.raw",
      "can.tuna.empty",
      "can.beans.empty"
    ],
    "skull_fire_pit": [
      "bearmeat",
      "chicken.raw",
      "deermeat.raw",
      "fish.raw",
      "hq.metal.ore",
      "horsemeat.raw",
      "humanmeat.raw",
      "meat.boar",
      "wolfmeat.raw",
      "can.tuna.empty",
      "can.beans.empty"
    ],
    "fireplace.deployed": [
      "bearmeat",
      "chicken.raw",
      "deermeat.raw",
      "fish.raw",
      "metal.ore",
      "horsemeat.raw",
      "humanmeat.raw",
      "meat.boar",
      "wolfmeat.raw",
      "can.tuna.empty",
      "can.beans.empty"
    ],
    "bbq.deployed": [
      "bearmeat",
      "chicken.raw",
      "deermeat.raw",
      "fish.raw",
      "horsemeat.raw",
      "sulfur.ore",
      "humanmeat.raw",
      "meat.boar",
      "wolfmeat.raw",
      "can.tuna.empty",
      "can.beans.empty"
    ]
  },
  "Blacklist": {
    "global": [
      "bearmeat.cooked",
      "chicken.cooked",
      "deermeat.cooked",
      "fish.cooked",
      "horsemeat.cooked",
      "humanmeat.cooked",
      "meat.pork.cooked",
      "wolfmeat.cooked"
    ]
  },
  "Smelting Frequencies (Smelt items every N smelting ticks)": {
    "global": 1
  },
  "Debug": false
}

Fuel Usage Multipliers cant be a floating-point integer

Thanks.  Fixed that.  Now I'm trying to tweak number to figure out how to get the same amount of charcoal as vanilla to come out and the fuel used to match vanilla so that FurnaceSplitter works correctly.  Thanks for all of the help.