This command enables and disables (toggles) 'LOD' - which disables the rendering of distant land and improves graphics performance (FPS).
tll
tll
If enabled, executing the above command will disable the rendering of LOD. If already disabled, executing the above command will enable the rendering of LOD.
ToggleLODLand
ToggleLODLand is simply a longer version (alias) of the TLL command - it has the exact same function.