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Thanks Ryan. Your comments made me realise that a Worksheet Change event could be used to trap when a change is made to a key column in a range and use that to trigger a lookup. If there's no change to a key column then there's no need to run a complex lookup but if there's a change to a key column then I just loop through the range and refresh the lookups. I need to test a little more but it seems to be working Ok.<br />
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Thanks for leading me to the solution
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I have a custom VBA function that performs a number of functions, including a Google address lookup on the net that makes the function slow. To avoid running it continuously I have installed it in a Worksheet Selection_Change event so that it runs only after I have moved to a new row. However I am looking for a better way of managing it, especially when I paste a whole range of new cells in my spreadsheet, as well as still running when I make a change to nominated columns. Any suggestions?
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I have a custom VBA function that performs a number of functions, including a Google address lookup on the net that makes the function slow. To avoid running it continuously I have installed it in a Worksheet Selection_Change event so that it runs only after I have moved to a new row. However I am looking for a better way of managing it, especially when I paste a whole range of new cells in my spreadsheet, as well as still running when I make a change to nominated columns. Any suggestions?

Best way of working with a slow VBA function

Microsoft Excel topics include formulas, formatting, VBA macros and user-defined functions, and everything else related to the spreadsheet user interface, including error messages.

Microsoft Excel

Microsoft Office is an integrated suite of applications that includes Outlook, Word, Excel, Access, PowerPoint, Visio and InfoPath, along with a number of tools to assist in making the individual components work together. Coding within and between the projects is done in Visual Basic for Applications, known as VBA.