Advanced VBA Tips for Data Analysis

Published: July 1, 2025

How Kenyan analysts process millions of rows in seconds instead of hours.

1. Use Arrays (100x Faster)

Dim Data As Variant
Data = Range("A1:Z100000").Value
' Process in memory — no slow sheet reads!

2. Turn Off Screen Updating

Application.ScreenUpdating = False
Application.Calculation = xlCalculationManual
' Your code here
Application.ScreenUpdating = True

3. Dictionary for Fast Lookups

Set Dict = CreateObject("Scripting.Dictionary")
Dict("CustomerID") = "Nairobi Branch"

4. Power Query + VBA Combo

ActiveWorkbook.Queries("SalesData").Refresh

5. Custom Functions (UDF)

Function KESProfit(Sales As Double) As Double
    KESProfit = Sales * 0.15
End Function

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