This is a dead simple oven/furnace multiplier with little performance impact.

Still using Q.Smelt ? Are you tired of burnt meat ?
Well.. let me welcome you to 2021.

This plugin takes advantage of all the new Oxide features in order to deliver the most lean oven/furnace multiplier.
Straightforward configuration, let's make our large furnaces x5 and refineries x2:

{
  "OutputModifiers": {
    "furnace.large": 5.0,
    "refinery_small_deployed": 2.0
  }
}