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2013-02-10T17:55:21.983
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Firstly: VBA UDF performance is extremely sensitive to the way the UDF is coded: see my series of posts about writing efficient VBA UDFs: <a href="http://fastexcel.wordpress.com/2011/06/13/writing-efficient-vba-udfs-part-3-avoiding-the-vbe-refresh-bug/" rel="nofollow">http://fastexcel.wordpress.com/2011/06/13/writing-efficient-vba-udfs-part-3-avoiding-the-vbe-refresh-bug/</a> <a href="http://fastexcel.wordpress.com/2011/05/25/writing-efficient-vba-udfs-part-1/" rel="nofollow">http://fastexcel.wordpress.com/2011/05/25/writing-efficient-vba-udfs-part-1/</a> You should also consider using an Array UDF to return multiple results: <a href="http://fastexcel.wordpress.com/2011/06/20/writing-efiicient-vba-udfs-part5-udf-array-formulas-go-faster/" rel="nofollow">http://fastexcel.wordpress.com/2011/06/20/writing-efiicient-vba-udfs-part5-udf-array-formulas-go-faster/</a> Secondly: The 12th post in this series outlines using the AfterCalculate event and a cache <a href="http://fastexcel.wordpress.com/2012/12/05/writing-efficient-udfs-part-12-getting-used-range-fast-using-application-events-and-a-cache/" rel="nofollow">http://fastexcel.wordpress.com/2012/12/05/writing-efficient-udfs-part-12-getting-used-range-fast-using-application-events-and-a-cache/</a> Basically the approach you would need is for the UDF to check the cache & if not current or available then add a request to the queue. Then use the after-calculation event to process the queue and if neccessary trigger another recalc.
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