Quick answer: Unreal level streaming causing hitches when a new sublevel loads? Synchronous load (bShouldBlockOnLoad = true) blocks the game thread. Configure async loading and pre-load distant cells.

An open-world game stutters when the player crosses a streaming boundary. The new sublevel synchronously loads on the game thread.

Async Load

UGameplayStatics::LoadStreamLevel(
  World, LevelName,
  true /*MakeVisible*/, false /*ShouldBlockOnLoad*/,
  LatentInfo);

Non-blocking. Engine streams the level over multiple frames.

Pre-Load Look-Ahead

Detect when the player is approaching a level boundary and pre-load the next cell. By the time they cross, the level is in memory — no hitch.

Streaming Distance

World Composition / World Partition has streaming distance settings. Larger distance = more memory but smoother experience. Tune by play test.

HLOD for Distant Cells

While cells aren’t streamed in, HLODs render proxies. Build HLODs in World Partition’s build menu; players never see “empty” world.

Verifying

Stat unit stable through level transitions. No hitches at boundaries. Memory usage tracked within budget.

“Blocking load = hitch. Async + look-ahead = smooth open world.”

Profile streaming on the slowest target hardware first — XL-spec dev PCs hide most streaming issues.