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Try and remove as much direct formatting as you can i.e., formatting applied via keyboard shortcut (CTRL+B) or toolbar button. Instead use styles (via the Styles and Formatting panel). This should both reduce the file size and increase the spreadsheet performance. Also, under File > Properties... > Font tab > uncheck the "Embed fonts in the document" option. If numerous fonts are being used and the font file sizes are large this can result in larger files and slower saves.