IE8 Script Warning "Stop running this script?" during Macro Code execution

IE8 Script Warning "Stop running this script?" during Macro Code execution

I am seeing a prompt in IE8 while executing a macro for a ZOHO Sheet.  The prompt is as follows:
"Stop running this script?"
"A script on this page is causing Internet Explorer to run slowly.  If it continues to run, your computer might become unresponsive."
 
An example of the code causing this is pasted below:
    Sheets("Sheet1").Cells(3,2) = 1
    Sheets("Sheet1").Cells(3,3) = 2
    Sheets("Sheet1").Cells(3,4) = 3
    Sheets("Sheet1").Cells(3,5) = 4
    Sheets("Sheet1").Cells(3,6) = 5
    Sheets("Sheet1").Cells(3,7) = 6
    Sheets("Sheet1").Cells(3,8) = 7





 
    Sheets("Sheet1").Cells(4,2) = 1
    Sheets("Sheet1").Cells(4,3) = 2
    Sheets("Sheet1").Cells(4,4) = 3
    Sheets("Sheet1").Cells(4,5) = 4
    Sheets("Sheet1").Cells(4,6) = 5
    Sheets("Sheet1").Cells(4,7) = 6
    Sheets("Sheet1").Cells(4,8) = 7





 
    Sheets("Sheet1").Cells(5,2) = 1
    Sheets("Sheet1").Cells(5,3) = 2
    Sheets("Sheet1").Cells(5,4) = 3
    Sheets("Sheet1").Cells(5,5) = 4
    Sheets("Sheet1").Cells(5,6) = 5
    Sheets("Sheet1").Cells(5,7) = 6
    Sheets("Sheet1").Cells(5,8) = 7





 
Is there any reason why the above operation would cause this script prompt to appear?


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