Guide to recognizing common level streaming hitches in your Unreal Insights captures and tips and links to resources to address them. Hitches refers to any work on the Game Thread or Render Thread causing a frame to go over its time budget and thus preventing a smooth frame rate. Level streaming involves many tasks including environment and gameplay actor loading, physics and rendering setup, garbage collection and game code that each can cause the frame to go over budget.
https://dev.epicgames.com/community/learning/tutorials/qpll/unreal-engine-level-streaming-hitching-guide