Excel/VBA Efficiency

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Question
Hi Stuart,

Would it be faster to reference values stored in a worksheet or to reference values stored in memory?

For example, if I have a small table of data, would operations on that data be faster when objects of each row of that data are stored in a collection in memory, or to reference each cell individually from a separate worksheet?

My intuition is that referencing the worksheet requires the data to be loaded into memory so having the data already in memory would eliminate that procedure.

Thanks for the clarification,
Jesse

Answer
In general, in writing vba procedures, I try to store the reference values in memory rather than on a worksheet. I believe this is most efficient.

If you'd like to send me a very clear and simple example of the type of procedure you're working with, I could be more specific about how I accomplish this.
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This topic answers questions related to Microsoft Excel spreadsheet (or workbook) stand-alone or Mircrosoft Office Excel including Excel 2003, Excel 2007, Office 2000, and Office XP. You can get Excel help on Excel formulas(or functions), Excell macros, charting in Excel, advanced features, and the general use of Excel. This does not provide a general Excel tutorial nor the basics of using a spreadsheet. It provides specific answers to using Microsoft Excel only. If you do not see your Excel question answered in this area then please ask an Excel question here

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Stuart Resnick

Expertise

I can answer questions relating to MS Excel formulas, or to programming with vba (Visual Basic for Applications) in the Excel environment. Please follow the following guidelines: your question should focus on one specific issue you want to learn. It's beyond the scope of this free service for me to create entire projects or complex vba solutions for you from scratch. You should be able to do most of the work yourself, and come here when you need help with a specific point you're stuck on. ALWAYS include a simple, concrete example illustrating what you want to learn. Explain this example in detail in the text of your question (what data is in which cells of which sheets, etc). Be very precise about the results you want, using this sample to make the logic clear. Always keep these examples SIMPLE. Never e.g. use 18 worksheets in your example if using 2 or 3 will do. Never use ranges like AI567:BB865 if using a range like A1:B3 will do. Thanks.

Experience

As a consultant, I've designed Excel tools since the 90s, working for the Federal Reserve Bank, AT&T, and (currently) Gap Inc.

Education/Credentials
My only "education" comes from 2 decades of doing spreadsheet/programming work, with major SF Bay Area corporations such as AT&T, Federal Reserve Bank, and Gap Inc.

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