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    Please define "huge" and "a lot of time". Commented Mar 2, 2012 at 12:38
  • For exporting a 25,000 rows and 12 columns it is taking 7 minutes. Commented Mar 2, 2012 at 13:51
  • @Hari Is the bottleneck in downloading the file or in generating the file? If the bottleneck is generating the file then Darknight's response is appropriate. You might want to also see if the database queries that retrieve the data for the Excel report can be tuned. Often the biggest performance hit is joining tables and retrieving the data from the database. If these queries can be improved or perhaps indexes and statistics can be improved by the DBA, then you could notice a dramatic increase in performance. Commented Mar 2, 2012 at 14:20
  • @maple_shaft the bottleneck as of now is in file preparation which is taking the 75% of the time. on the query side it is a simple query and there is no joins on the query. But as you had mentioned we will have a look in the indexes. Commented Mar 2, 2012 at 14:31
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    -1. I think this question is too vague. There are endless things you can do to improve an applications performance. There is not enough information here to provide a useful answer. Commented Mar 6, 2012 at 21:36