Not usually, but it can depend what is being waited on, and since shell extensions load 3rd party code into Opus all bets are off ultimately.
From v9 to v11 support for additional shell extension types was added, which adds to that possibility.
Did you try disabling everything not from Microsoft using ShellExView?[/quote]
Sorry - I've been working on a whole lot of stuff. I've finally been able to disable the significant majority of non-Microsoft shell extensions. Some are items I cannot disable (e.g. antivirus), but I also think I've isolated what is responsible for most of the issues.
For reasons linked to the same reason I use Directory Opus, I use a file contents search tool (File Locator Pro). I believe there is a conflict when both Directory Opus and File Locator Pro are trying to do something at the same time. File Locator Pro continues to work, but Directory Opus generally cannot recover when they get into conflict.