Products: Nintex Workflow for SharePoint (2016, 2013, 2010)
Avoid “All” and “Item” Content Types
To prevent lengthy content type evaluation when saving or publishing reusable workflow templates, avoid selecting “All” or “Item” for the content type. Instead, create a content type based on Item and then select the created content type when defining the reusable workflow template.
For instructions on creating content types, refer to the SharePoint documentation.
For more information about the evaluation process that Nintex Workflow uses for content types, see the following MSDN article: http://msdn.microsoft.com/en-us/library/office/microsoft.sharepoint.spcontenttypecollection.bestmatch