This is anecdotal, but I manage my golf league scoring with a relatively complex multi-sheet spreadsheet. In 2005 I couldn't even open it in docs. In 2010 I cou

This is anecdotal, but I manage my golf league scoring with a relatively complex multi-sheet spreadsheet. In 2005 I couldn't even open it in docs. In 2010 I could open it, but many formulas didn't work. In 2013 most things worked, but it was unusably slow. Today it works flawlessly in Google Sheets and I don't even bother opening Excel anymore for it. I'd say they've definitely made some upgrades.