I am using excel 2007 and I appear to have continual "calculating delays", which can run for fifteen minutes. I have approximately five columns of data that can take up to 50,000 rows downward. I know this is a lot of data, but should it take that long and bog down my computer or is there a problem with my spreadsheet in how it's calculating the data? I'm just curious if anyone else has this problem or if I'm doing something wrong.. Thanks in advance