I don't have idea of what data is being used in the workbook. If its excel or some other file, the issue can happen based on data volume and complexity.
We faced similar issue when we tried to have large excel file as part of a Tableau workbook. When we extracted data from the workbook and stored as TDE, things became fast. Reason: TDE is proprietary data source and its fast to access for Tableau.
Hope it helps.