Excel 2010 is very slow at inserting automatic subtotals. How can I resolve this?

How can I resolve this?

In addition to Mr Oskar's Suggestion..
Basically inserting subtotal is adding rows for each group and inserting formula for SUM,COUNT etc.If your data has many rows obviously that will take more time.You may try once with PIVOT TABLE
Best Regards,
Asadulla Javed, Kolkata
Please do not forget to click “Vote as Helpful” if any post helps you and
"Mark as Answer”if it solves the issue.

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