Modders ‘Boostin4kix’ ‘Linas’ and ‘ScoutBr0’ have released a new mod for The Witcher 3. As its title suggests, the Next Generation LOD mod improves distant objects and buildings by replacing their models/meshes with higher quality ones, resulting in less pop-in.
Source: N4G PC The Witcher 3 Next Generation LOD Mod improves distant objects and buildings