The Performance Bottleneck
Pivot Tables are one of Microsoft Excel’s most powerful features, allowing you to instantly summarize and analyze hundreds of thousands of rows of data. However, this power comes at a steep computational cost. By default, every time you drag a new field into the Pivot Table “Rows,” “Columns,” or “Values” boxes, Excel instantly recalculates the entire table. If you are working with a massive dataset (e.g., a million rows of sales data) or pulling data from a slow external database, this automatic calculation will cause Excel to freeze for several seconds (or even minutes) after every single click. You cannot build the layout you want because you are constantly waiting for the application to stop thinking.
How to Defer Pivot Table Updates
To fix this, you need to turn off the automatic calculation engine specifically for the Pivot Table you are currently building. This allows you to drag and drop multiple fields into your desired layout instantly, and then command Excel to perform the math only once at the very end.
1. Open your Excel workbook and click anywhere inside your existing Pivot Table to activate it.
2. This will reveal the PivotTable Fields pane on the right side of your screen (where you drag and drop your data columns).
3. Look at the very bottom of the PivotTable Fields pane, below the four quadrant boxes (Filters, Columns, Rows, Values).
4. You will see a checkbox labelled Defer Layout Update.
5. Check this box.
Once checked, the automatic calculation is paused. You can now freely drag fields in and out of the Rows and Columns boxes. The main Pivot Table on your spreadsheet will turn grey and will not change, allowing you to work at maximum speed without the software freezing.
6. When you have finished arranging your layout and are ready to see the final numbers, click the large Update button located immediately to the right of the “Defer Layout Update” checkbox.
Excel will now run the massive calculation one time, saving you from suffering through a dozen intermediate loading screens.
How to Stop Automatic Refreshing on File Open
Another common annoyance is a Pivot Table that forces a massive data refresh the moment you open the file. If you want to stop this and only refresh the data manually:
1. Right-click anywhere inside the Pivot Table.
2. Select PivotTable Options… from the context menu.
3. In the dialog box, click on the Data tab.
4. Uncheck the box next to Refresh data when opening the file.
5. Click OK.
The file will now open instantly using the cached data from the last time it was saved.