This article lists several things that you can do to
improve the speed and performance of your subforms.
To improve subform performance, try these tips:
- If you can, base your subforms on queries rather than
tables. Include only those fields from the record source that are absolutely
necessary. Extra fields can decrease subform performance.
- Index all the fields in the subform that are linked to the
main form. Indexes help speed the search process to find the matching subform
- Index any fields used for criteria (such as when a subform
is based on a criteria query).
- If you are linking on multiple fields, add a calculated
field to the main form that concatenates the fields. Then create a calculated
column in the subform's RecordSource property query with the same expression. For example, to link to
the subform on an Employee ID field and an Order ID field, add a text box to
the main form with the following properties:
Name: EmployeeIDOrderID Next, add the following field to the query that the subform is
ControlSource: =[EmployeeID] & [OrderID]
EmployeeIDOrderID: [Employee ID] & [Order ID]
Finally, link the main form and the subform on the concatenated
field rather than on the two individual fields. The subform properties may
appear as follows:
LinkChildFields: EmployeeIDOrderID Because Microsoft Access has to compare only one criteria to
return the subform's recordset, the subform's performance should improve.
- Set the subform's DefaultEditing property to Read-Only if the records in the subform are not going to be edited.
- If your subform is a continuous form and contains combo
boxes, explicitly justify the combo box in the subform's form Design view. This
practice prevents Microsoft Access from determining the proper justification of
the combo box values for each record, and therefore speeds the display of
subform records that have combo boxes.
For more information about general performance and
indexingrecommendations, click Microsoft Access Help
on the Help
menu, type optimize performance
in the Office Assistant or the Answer Wizard, and then click Search
to view the topic.
Article ID: 209113 - Last Review: October 25, 2013 - Revision: 3.0
- Microsoft Access 2000 Standard Edition
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