Quote from terraunity on December 13, 2021, 9:46 am

TerraWorld can create huge real-world maps with dense vegetation and 3D models to create close to reality and highly detailed environments.

For this to happen, TerraWorld uses built-in techniques such as GPU Instanced Rendering, Compute Shaders, Auto LOD and frustum culling, data baking for placed assets via patches in order to batch render models and etc.

TerraWorld's intelligent Culling & LOD system manages scene objects and toggles them based on what camera sees in screen space through its frustum culling volume both in editor and game views.

Stable framerate throughout the entire scene makes it easier to debug performance and develop highly detailed maps for any target platform ranging from mobile devices up to high-end machines.

You can join our Discord channel to ask questions and get support from our team and hundreds of community members from here: https://discord.gg/QgPpNpE

Source: https://forum.unity.com/threads/terraworld-automatic-level-designer-for-real-world-locations.784217/page-6#post-7442081