Safely Experimenting with Thread Priorities Without Crashing

Thread Tweak changes how Minecraft's threads are scheduled, and aggressive settings can cause crashes, freezes, or worse performance. This guide shows you how to experiment safely and recover if something goes wrong.

Before You Change Anything

Write down the default priority values shown in the Thread Tweak screen. If the mod does not show defaults, note that most pools start at normal priority. Also make a backup of your mod config folder so you can restore it if the game becomes unplayable. Never change more than one pool at a time — if something breaks, you need to know which change caused it.

Making One Change at a Time

Pick a single thread pool and adjust its priority by one step. Play for several minutes in a representative area (your base, a busy farm, or while exploring). Watch for freezes, audio stutters, or the game becoming unresponsive. If any of these appear, revert that one change immediately using the in-game controls. Because Thread Tweak works in real time, you do not need to restart to undo a bad setting.

Recovering from a Bad Configuration

If the game freezes on startup because of a saved priority setting, close it and edit or delete the Thread Tweak config file from your config folder. Restart the game and it will regenerate defaults. Avoid setting any pool to the absolute highest or lowest priority — extreme values are the most common cause of instability and rarely improve performance.