Performance Booster

Subnautica also renders(draws) base components and other objects like the Cyclops and Seamoth up to 1700m away regardless of if the player is above the water or below the water. You can only see about 200m away while underwater because of the water haze, so the mod will only render objects within this distance when the player is underwater. This can sometimes double the frame rate if you are looking in the direction of your base etc while more than 200m away.

The mod also reduces the above water render distance from 1700m to 1000m to further improve performance while above the water. The downside to reducing the render distance is that you need to get closer to things like the Aurora and islands before they appear. However, both the underwater and above water distances are configurable using sliders in the Graphics options menu so you can increase or decrease the distances to your preference. The maximum values are Subnautica's default values. Higher distances mean lower performance.

The mod also reduces the distance at which high detail versions of objects are rendered by reducing the LOD Bias value from 10 to 1. 3. This can be adjusted using the HD Distance slider in the Graphics options menu instead of having to adjust it from the F3 menu. Higher values means lower performance.

Subnautica and many other Unity based games are known to have really bad performance on systems with CPU's that have Hyperthreading or SMT. The workaround has been to only enable physical CPU cores by setting the affinity of the Subnautica process in Windows Task Manager. This mod will automatically force Subnautica to only use 3 physical CPU cores by default to boost high load performance by about 80% on some systems so you don't need to use Task Manager or other methods like Process Lasso to adjust the affinity.

NOTE(2020-10-27): A recent Subnautica update seems to have fixed the CPU affinity issue since I do not notice any performance improvement by disabling cores. I have updated the mod with an option under General Options to enable or disable the CPU affinity tweak just in case there are still some people who still benefit from this tweak.

If your CPU has more than 4 cores there will an option under General options to select the number of cores to use, so you can experiment to find the best number for your system. After loading a save file go to the graphics option menu and turn on the framerate display option. Go to the General options menu and select different numbers of cores to see which one gives the highest fps.

If you only want the processor affinity tweak, just put all the distance sliders the the Graphics option tab to the