unreal-world-partition

Enable World Partition with streaming on, start with the default 2D Runtime Spatial Hash and one runtime grid, then place streaming sources on the player or via a WorldPartitionStreamingSourceComponent. Derive loading range from maximum travel speed times worst observed load latency plus a safety margin.

Place a temporary streaming source at the destination, enable it, and poll UWorldPartitionSubsystem::IsStreamingCompleted before moving the player. Keep the source active until the normal player source owns the destination cells, and provide a timeout fallback instead of teleporting into unloaded collision.

Runtime Data Layers control whether world content is Unloaded, Loaded, or Activated for stateful world variants, with the server owning state in networked play. HLOD replaces distant unloaded content with proxy visuals only; it is never authoritative collision, interaction, or gameplay state.

No. OFPA stores actor edits in external files so teammates can edit different actors without checking out the whole level, but it does not prevent two people changing the same actor or logical conflicts between related actors. It is an editor workflow; cooked builds embed actors into level packages.

Diagnose in layers: check the streaming source's location, state, and priority; verify the runtime cell is generated and requested; confirm Is Spatially Loaded, Data Layer state, and grid assignment agree; then check hard references that bundle distant actors. Use wp.Runtime.ToggleDrawRuntimeHash2D and stat streaming to visualize.

Avoid it for small maps that fit the memory budget, where streaming complexity adds no value, or when a legacy discrete-sublevel architecture already works and conversion risk exceeds its benefit. Do not introduce World Composition in new UE5 projects.