Playing the game attached to Case 1108597 in 2019.3.0a3 editor feels very slow and unresponsive compared to earlier Unity versions. Looking at the Profiler shows a 43ms cost on "EditorLoop" pretty much all the time. What can I do to get rid of this cost and make it playable in the editor again? "Deep Profile" unfortunately does not reveal any information on that EditorLoop entry. Spoiler: Profiler Hierarchy Spoiler: ProfilerTimeline I did not have any object selected where an expensive inspector window was shown. Only the game view, hierarchy, project window and console was visible.