MAC OSX MS Office 2011 - I have one (v.important) spreadsheet that has become VERY slow and unresponsive. It's 3000 lines x 12 columns. It has remained this size, but with different data, for several years without issue. All cells just data except two cols with a very simple formula in. No macros. Copying one cell to another takes minutes. Copying, say 5 cells hangs up, copying more crashes. Tried opening in Open office and Apple Numbers and Excel on a different (windows) machine. More or less same result. Other spreadsheets OK. Have set calculation to manual. Any ideas?
Solved by E. F. in 18 mins