From Tayyab Hussain, via chandoo.org.
Tips for Formula Speeding Up
No doubt excel is a powerful analytical tool but most of the people do not plan before designing there spreadsheet. One should plan the Start and End in mind, and the assumption that the spreadsheet will never be used again should kept out of mind. Perhaps this is might be the number one rule. Spreadsheets are about giving correct information to the user, not possible erroneous information that looks good. Continue reading