There’s now around 10000 and One forum posts about HLODs being broken…
If you actually want something usable and this isn’t just for testing the engine, then you probably want to revert back to 4.something, build it from source, and use meshes instead of landscapes.
And no, i dont thing ue5 from source - or even an nvidia build - would make any difference to acrually being able to run and depoy marketable projects…