Here is an excellent resource on speed and memory consideration in XL...

http://www.decisionmodels.com/index.htm

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HTH...

Jim Thomlinson


"thom" wrote:

I am calculating three spreadsheet that have many formulaes in each. There
are multiple files I need to perform this calculation. As I go thru the 2nd
-3rd and 4th spreadsheet, the caculation time increases until it just locks
up. Any help on how I can solve this problem?