I recorded how long it takes URC to revert a single file (in this case it was a spline). In other revision control systems its instant, so I wanted to bring it up. At the end of the video, me recording doesn’t allow the window to show, but as long as I stopped recording it showed.
When reverting an actor (something that is placed in the world), some of the world data needs to be reloaded and re-initialized to reflect the change on disk for that actor in the viewport. The revert source control operation is quick (for example: try reverting a material from the ContentBrowser). However, the reloading of the world data is known to be a slow operation in large projects.