Hi. Unity 2019.3b includes some improvement for iterating editor works, like domain reload related features. But I found that this simple bug (or by bad design) is not fixed even it significantly impact to editor iteration time. (In my project, it added 3~5sec to every single click of object. Scene-editing is almost impossible!) https://issuetracker.unity3d.com/issues/hdrp-editor-is-lagging-when-modifying-material-properties Surprisingly, it is reported at 2018.3b! and it seems that Unity completely forgotten this issue so I bumped this to the forum.