This mod disables Minecrafts "optimized" DFU system resulting in Minecraft not maxing out every CPU thread while loading the game. This mod is client-side only and should make no effect to gameplay.
This mod was inspired by a recent Forge change resulting in the same change. https://github.com/MinecraftForge/MinecraftForge/commit/05297fd72fa99e9ff020fee3ee365ad51bcaf8f0