Excel Office 365 2016 So Slow that I cannot use it

Hello John,

Welcome to Microsoft Community.

To resolve this issue we need more information. Let us know the following:

1. Does this issue happen on all spreadsheets opened in Excel 365/2016 or a few?
2. Have you checked if you are able to open new blank spreadsheets and tried moving between cells and copying large amounts of data to a new spreadsheet within the same workbook, while working on the new blank spreadsheets?

You may also check if this issue occurs while working in the clean boot mode on your computers.

Refer the article below to start the computer in clean boot:

http://support.microsoft.com/kb/929135

Note: The steps as mentioned for Windows 8 and 8.1 also apply for Windows 10.

After restarting your computer in Clean Boot mode open Excel 365/2016 and check if they work fine and you are able to move between cells and copy large amounts of data to a new spreadsheet with the same workbook.

If the issue resolves while working in the Clean Boot environment then follow the steps as mentioned under the heading ‘If you could not run a program before you performed the clean boot’ which is below the option What is next when I have a clean boot environment?

Important: Please refer to the section: How to reset the computer to start as usual after troubleshooting with clean boot of the Kb article to boot the computer in normal startup after fixing the issue.

Hope the above information helps. Please reply if you need further assistance.

Thank you.

1. Does this issue happen on all spreadsheets opened in Excel 365/2016 or a few?  Doug225:  only happens when I open existing spreadsheets.  I was using Office 365 2013 previously.  New spreadsheets work as expected.  I have tried copying data converted to values to new Office 365 2016  but same slow running condition happened.
2. Have you checked if you are able to open new blank spreadsheets and tried moving between cells and copying large amounts of data to a new spreadsheet within the same workbook, while working on the new blank spreadsheets?  Doug225:  new blank spreadsheets work as expected.  When I copy data from old exisiting spreadsheet into new spreadsheet, spreadsheet turns sluggish and runs too slow to work.

You may also check if this issue occurs while working in the clean boot mode on your computers.  Doug225:  Have tried clean boot but it did not improve the slow running of existing spreadsheets.  Have tried this on several different laptops and all were unsuccessful.

Thank You for writing back... really need a solution for this as I am a 1099 contractor who makes a living using Excel spreadsheets.

Thank You,

Doug225:

There were similar complaints about 2013 apps when they were first released.  It was a bad interaction with very specific hardware and driver combinations.

Since you have already tried "every recommendation" you leave us nothing else to suggest. Please tell us what you have tried so we can see if we have any different suggestions.

Hello John,

Welcome to Microsoft Community.

To resolve this issue we need more information. Let us know the following:

1. Does this issue happen on all spreadsheets opened in Excel 365/2016 or a few?
2. Have you checked if you are able to open new blank spreadsheets and tried moving between cells and copying large amounts of data to a new spreadsheet within the same workbook, while working on the new blank spreadsheets?

You may also check if this issue occurs while working in the clean boot mode on your computers.

Refer the article below to start the computer in clean boot:

http://support.microsoft.com/kb/929135

Note: The steps as mentioned for Windows 8 and 8.1 also apply for Windows 10.

After restarting your computer in Clean Boot mode open Excel 365/2016 and check if they work fine and you are able to move between cells and copy large amounts of data to a new spreadsheet with the same workbook.

If the issue resolves while working in the Clean Boot environment then follow the steps as mentioned under the heading ‘If you could not run a program before you performed the clean boot’ which is below the option What is next when I have a clean boot environment?

Important: Please refer to the section: How to reset the computer to start as usual after troubleshooting with clean boot of the Kb article to boot the computer in normal startup after fixing the issue.

Hope the above information helps. Please reply if you need further assistance.

Thank you.