The ue4 landscape has a bunch of issues. Performance is one of the more critical parts - and is completely ignored by Epic…
DCC stands for Digital Content Creator.
Basically any 3d editing software that let’s you change/create meshes in this case.
In 2022 there’s way better ways to handle something like a landacape if it was being coded from scratch. Unfortunately Epic doesn’t seem interested in that so far.
There’s a few community efforts - Or private efforts - but generally speaking, we are all intent on making realistic or procedural words, which has its own set of performance concerns.
Voxel plugins and the like, are also a performance consideration (as in they take more to run), but they give you a lot better options and include runtime editing, so it’s something to consider…