I copied last year’s expenses spreadsheet (.ods format) and deleted the data to start this year’s file. I made a couple of entries. It saved extremely slowly.
I checked the file size: 40,902 KB. The file I copied was 92 KB. What might have happened? How do I fix this?
Have you got some links to external data? Any formula creating huge amount of data due to date change? Hard to tell without the sheet.
Embedding fonts?
What do you expect if you deleted all data? What do you want to fix, is there anything broken?
I believe the file generated some dirt, starting from the original file redo the file and save it, and reopen it to insert new data.