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I think your best option would be to create an aggregated table/view in your database.
Use this to do your visualizations and link in the row level data only for drill downs where required.
Hope this helps
ps. If you have a lot of calculations within your views it should improve the performance on the report if you also create these on your database. Reducing the work required by tableau to just displaying a visualisation.
Please try the below links:
Let me know if it helps