Volatile Functions on Google Sheet.

Hi, this may be a stupid question so please bare with me. On google sheet, I have created a spreadsheet that make use of the indirect function for several hundred cells, and the calculation seems to be be instant but once i download it and open it in excel, the message "calculating: (8processors(s))" keeps appearing every time i edit a cell. I have found the reason behind this is because indirect is a volatile function and it causes excel to re-calculate all the formulas whenever a cell is changed, but why doesn't this happen to google sheet?