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# SUM IF in a very big worksheet slows my computer. Any idea to improve current situation.

Posted on 2011-09-14
Medium Priority
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Hi,

My problem: the SUM IF array formulas I use aldo accurate are too numerous, check too much cells and use many conditions making my computer while recalculating them very slooooow....
The worksheet I work with is usually around 85000 lines long.

Context: I have to calculate the Fill Rate%, Total per Ad Size and per Category by
- per site (around 250+) in one worksheeet.
The calculated cells are the yellow ones in R, S, T, U.

Note: both (4), (3), (250+) listed above are current numbers but they might be more in the very near future.

I need to do those calculations in the worksheet while keeping the current layout as I will use it to do a pivot table of the results afterwards.  I wouldn't want to chunck my worksheet in smaller ones and have to merge the data afterwards as value afterwards...

Any way you think that could improve my situation?

-------------------------------------------------
My data is segmented by:
Ad categories: CPM, Remnant, No Cost, Marketing
Site Names: 250+

I have used the following formulas (as arrays) and they are accurate.

1) To calculate the numbers of impressions per Ad Sizes
=SUM(IF(\$D\$2:\$D\$100000=\$D543;IF(\$V\$2:\$V\$100000=\$B543;IF(\$A\$2:\$A\$100000=A543;\$N\$2:\$N\$100000;0);0);0))

2) To calculate the numbers of impressions per Ad Categories:
=SUM(IF(\$D\$2:\$D\$100000=\$D543;IF(\$V\$2:\$V\$100000=\$B543;IF(\$A\$2:\$A\$100000=A543;\$N\$2:\$N\$100000;0);0);0))

3) Fill Rate: S543/T543

A document with some data is attached for your comprehension.

Thanks
20110914-ExpertsExchange-workdoc.xlsm
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Question by:fredericgilbert
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Accepted Solution

barry houdini earned 2000 total points
ID: 36538861
It should be much faster to use SUMIFS function, try this for formula 1 (sum range must come first)

=SUMIFS(\$N\$2:\$N\$100000;\$D\$2:\$D\$100000;\$D543;\$V\$2:\$V\$100000;\$B543;\$A\$2:\$A\$100000;A543)

Formula 2 can be amended in the same way

regards, barry

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Author Comment

ID: 36539116
Hi BarryHoudini,

I will test them tonight and get back to you.
Sounding promising at first sight.

Bye
fg
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