VBA: implementing WorksheetChange Event Triggering Multiple Times for Large Data Sets
I'm working with a question with the `Worksheet_Change` event in Excel VBA that seems to be causing performance optimization when handling large data sets. My code is supposed to update a summary sheet whenever a change is made in a specific range of cells in my data sheet. However, for a range containing thousands of rows, the event triggers multiple times for a single update, leading to important slowdowns and even freezing Excel in some cases. Here’s a simplified version of my code: ```vba Private Sub Worksheet_Change(ByVal Target As Range) If Not Intersect(Target, Me.Range("A1:A1000")) Is Nothing Then Application.EnableEvents = False Call UpdateSummary Application.EnableEvents = True End If End Sub Sub UpdateSummary() Dim wsSummary As Worksheet Set wsSummary = ThisWorkbook.Sheets("Summary") ' Logic to update the summary sheet End Sub ``` I've tried adding `Application.EnableEvents = False` at the start of the event to prevent it from triggering recursively, but it doesn't seem to help; the event still fires multiple times. I also tried checking the count of modified cells using `Target.Count` but that didn't yield any useful results. Moreover, I tested using `DoEvents` within the `UpdateSummary` subroutine to give Excel some breathing space, but the freezing continues. I suspect that with a large number of changes, Excel gets overwhelmed. Is there a better method to handle this situation effectively without sacrificing responsiveness? Any suggestions or best practices would be greatly appreciated!