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Excel scrolling very slow

Posted on 2016-09-23
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Last Modified: 2016-09-24
I have a workbook I use every day.  Last night I noticed that scrolling using the arrow keys, it goes very slowly.  It goes to the next cell, then there is a delay before going to the next cell.  This does not happen in any of my other workbooks.
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Question by:rrhandle8
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Expert Comment

by:bigeven2002
ID: 41813371
Hello,
Which version of Excel are you using?
Is the scrolling latency happening on just the one workbook or any workbook?
Is the workbook in classic or native format?
Does the workbook use any macros?
If you use Tab to go to the adjacent cell, does it have latency like the arrow keys?
Do you have any other excel files open at the same time?
Did the latency just start?  Have you rebooted the computer to see if it persists?
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Author Comment

by:rrhandle8
ID: 41813406
Which version of Excel are you using?
2010 but this workbook is 2003
Is the scrolling latency happening on just the one workbook or any workbook?
Just the one
Is the workbook in classic or native format?
Please explain the difference
Does the workbook use any macros?
Yes. All my workbooks contain macros
If you use Tab to go to the adjacent cell, does it have latency like the arrow keys?
Yes. Acts just like the arrow keys
Do you have any other excel files open at the same time?
Yes and they all work just fine
Did the latency just start?  Have you rebooted the computer to see if it persists?
 Started last night. Rebooted the computer a few times and also did the "Open and Repair"

Additional note: A week ago I made a back-up of the workbook.  I opened the back-up this evening, and the arrow keys work fine.  I would go back to using the backup, but the workbook gets appended with new information every night.
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Expert Comment

by:bigeven2002
ID: 41813424
Ok thanks for the update.  For Classic vs native, is the workbook in xls or xlsm format?  Since the work book worked fine last week, how many rows of data are in the work book currently?
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Author Comment

by:rrhandle8
ID: 41813426
Tens of thousands
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Author Comment

by:rrhandle8
ID: 41813427
It is .xls. I converted to .xlsm.  Still does not work.  Previous ones in the .xls format work fine.
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Accepted Solution

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bigeven2002 earned 500 total points
ID: 41813754
OK the old xls format can only handle up to 65000 rows, so as you approach that limit, there will be a performance impact as you are seeing.

Try this, create a brand new blank XLSM file, and then copy over the rows to the new file say 1000 at a time.  When you reach 10000, save and close the file, reopen to see if performance is normal, if so, continue with the next 1000 until reaching 20000, repeat.  If the text has any formatting, be sure to paste without the formatting.

If performance stays normal throughout the entire copy process then copy over the macros, save, close and reopen.  Is performance maintained?

Also, is your Office 2010 up to date with that latest service pack and updates?
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Author Comment

by:rrhandle8
ID: 41813829
I was planning to do what you recommended.  Knowing there were a lot of Defined Names in the workbook, I was wondering how I would move these to the new workbook.  I opened "Manage Names" to see what was all there.  To my surprise, there were hundreds of Defined Names that all started with "ExternalData_".  See image. I do not know where they came from, but I am sure some macro is creating them.  After I deleted all of them, saved, closed and reopened the workbook, everything is working just fine.

Thanks for pointing me in the right direction.

2016-09-24_9-50-35.png
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Author Closing Comment

by:rrhandle8
ID: 41813832
bigeven2002 pointed me in the right direction.
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Expert Comment

by:bigeven2002
ID: 41813835
OK great!  Glad I could help!
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