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Excel worksheet with 5 data validated columns brings performance to a crawl. Why?

  1. #1
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    Exl worksheet with 5 data validated columns crawls performance->VBA error caused it!

    Hi there,

    I have a Excel 2003 workbook with 10-some sheets. One sheet contains several lists on which named ranges are based (about 20 named ranges). The named ranges are used on several other sheets to perform data validation. I have a few sheets with 4-5 colums which have data validated cells, based on those named ranges. Some ranges are static, other are dynamic .

    When i start Excel and open this workbook, performance is adequate. As soon as i have switched between the data validated columns 10-20 times (by moving the cursor right and left), performance begins to decrease to a point where changing columns (e.g. go from column a to b) takes 2-5 seconds, where cpu is 100% during this 2-5 seconds. Only after the 2-5 seconds, the down arrow for the data validated cell appears.

    It seems like Excel is performing every calculation involved in every data validated cell every time i move to another cell, and doesn't release memory when doing it. Now i know dat many data validated cells influence performance, but this is unworkable. And the number of data validated cells doesn;t seem ridicilous high to me.

    Any ideas?

    PS. it doens't matter how many rows in the sheet are filled, behaviour starts when 0 rows are filled. Data validation is defined on 5 columns of 1000 cells.

    PS Asus Notebook with 1Gb Ram, Win XP, 1.4 GHZ

    ** Update ** Poor VBA programming was the cause, not data validation
    Last edited by pwhooftman; 03-09-2007 at 12:44 PM.

  2. #2
    Forum Expert oldchippy's Avatar
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    You might find an answer on this link?

    http://www.mvps.org/dmcritchie/excel/slowresp.htm
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  3. #3
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    Thanks Oldchippy,

    Turns out that the problem is not in the data validation but in this piece of VBA in the worksheet. I can't figure out what makes Excel go to a crawl after this code has been run 20-40 times.

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    Last edited by pwhooftman; 03-09-2007 at 05:13 AM.

  4. #4
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    I have reworked my code, and this works much better

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