DH only loads already visited chunks even though I play singleplayer

Solution
If it feels like LoD generation with
Install Noisium and Faster Random, these mods optimise world generation code.
Try increasing
To see if
1) Check CPU usage while in-game, using
2) Go to
Enabling both settings will show you the visualization of world gen tasks queued and working on the map (blue boxes for queued tasks, red boxes for working tasks)
Distant Generator is too slow:Install Noisium and Faster Random, these mods optimise world generation code.
Try increasing
CPU Load in Distant Horizons settings for faster generation, but you will experience more lag spikes and stuttering due to heavier workload on CPU.To see if
Distant Generator is really working or not:1) Check CPU usage while in-game, using
Aggressive settings of CPU Load. If CPU usage's hovering around 80-100%, the LoDs are generating in the background.2) Go to
DH settings > Advanced Options > Debug > Wireframe, set Enable Debug Wireframe Rendering and Show World Gen Queue to True.Enabling both settings will show you the visualization of world gen tasks queued and working on the map (blue boxes for queued tasks, red boxes for working tasks)