I am facing this same issue with scene capture stopping the game for a brief moment. Some hints on how to solve this would be greatly appreciated!
Or is it even possible to do asynchronous renders in UE? I believe it should somehow be possible since for example render target can render another image of the same scene without any interruptions: https://www.youtube.com/watch?v=c4YCMK9L9qI Or am I missing something here, is this render target somehow fundamentally different compared to how scene capture works?