Assumimg you are in Manual Calc Mode I can think of 2 possibilities:
1 Excel is taking a long tong time to update the dependency trees
2
Excel is taking a long time to update the formulas in your workbook so that they point to the new location after insert/delete.
For 1 Try switching ForceFullcalculation on (FXL workbook calculation settings) . This forces every calc to be a full calc rather than a recalc but eliminates maintaing and building the dependecy trees.
For 2 I don't know of a simple solution
Regards
Charles