Forum Discussion
How to handle massive workbooks that freeze and choke Excel? Let's share tactics
Hello Albert_Vile11a,
One thing that helps me is diagnosing the bottleneck before changing the workbook.
I will start with Microsoft’s drill-down approach:
- Time the workbook calculation, then narrow it down to the slow worksheet and formula blocks.
- Check volatile functions such as TODAY, OFFSET and INDIRECT. Microsoft notes that these can increase recalculation time.
- Check oversized ranges. Ctrl+End can reveal a used range that extends far beyond the actual data.
- Check conditional formatting. Large numbers of conditional-format rules can slow calculation.
- Check repeated calculations, large lookup ranges, defined names and external workbook links.
Microsoft docs:
Excel performance: Improving calculation performance
https://learn.microsoft.com/en-us/office/vba/excel/concepts/excel-performance/excel-improving-calculation-performance
Excel performance: Tips for optimizing performance obstructions
https://learn.microsoft.com/en-us/office/vba/excel/concepts/excel-performance/excel-tips-for-optimizing-performance-obstructions
The key question for me is: does the freeze happen during calculation, or when Excel is displaying or updating the sheet? That usually determines where I investigate first.
There is a problem with this forum: I wrote separate thank-you messages to both participants. These messages were held for review and were not published. What do I need to say to get them published? Moderator: would you be so kind as to thank both of them for their replies on my behalf?
Hi Olufemi. Thanks for jumping in with such a structured diagnostic approach.
You hit the nail on the head when talking about tracking down the root cause before changing anything. But shifting to the other side of the coin, my biggest headache usually starts even before the data hits the sheet. The real pain comes from dealing with external reports, web tables, or data feeds that are an absolute nightmare to copy. They come completely locked down, or with broken formatting that wrecks your clipboard and litters the workbook with garbage cells right from minute one.
At the end of the day, how do you guys manage to rescue that raw data cleanly when the source or the website refuses to cooperate?
