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Three or More Rows in OLAP PivotTable Causes the UI to Freeze and Chrome to Display "Page Unresponsive"

Description: 

Three or more rows in the DataSourceSettings json of an OLAP PivotView causes the UI to freeze for many seconds to minutes, and Chrome displays "Page Unresponsive" error dialog (see attached screen capture). Note that UI elements outside the pivot table will also become unresponsive. When the DataSourceSettings has only one row, the pivot table behaves normally.

I'm providing a simplified StackBlitz demo from your Adventure Works OLAP Pivot View example.


Steps to Reproduce:
  1. Go to this prepared StackBlitz demo
  2. Observe that the web page UI becomes unresponsive while the pivot table is loading.
  3. Observe that Chrome browser may display a "Page Unresponsive" error dialog.
  4. In the code, remove the second and third "row" from the dataSourceSettings.
  5. Reload the page.
  6. Observe that the pivot table behaves as expected.