Only 1/4 of my heightmap is imported

The map import is probably saying “screw you, this map is X pixels wide, im using the settings I want to use”.

Its like a trend you have to get used to with the engine…

2X2 is definitely best.
1024 components may still be a lot (1024 draw calls just for that landscape tile).

4033 is a bit off scale (they screwed the technical guide to where its not only non technical but also just wrong).

If you are ostinate about using landscape (instead of taking things to a DCC and having a much easier life + a lot better performance) I would suggest splitting the landscape into 4 tiles of around 2k max in size - if this is how big your landscape will ever get.

Now there are other considerations to this.

For instance, if you want your gameplay to happen in the center of the map, then you have to split things to where you have a full tile in the center and not a tile intersection (because then all landscapes are always loaded leading to poor performance).

In that case spit into 3x3 (of 1k each or just about?) Will do better. OR, and that is an option if you benchmark, you can stick to the single tile at 4k res (but it shouldn’t be 4033. Its a power of 2 number +1 usually).

I suggest getting the info off of way back machine (and just using the old system rather than the sorry replacement that doesnt work they came up with) when using tiles/landscape.