Maximum Spreadsheet size on iPad

Dear All
Please let me know what is your maximum size spreadsheet that you have successfully used on your iPad?
I am working towards developing educational software for the iPad and have a spreadsheet that is currently 1682KB - 5775 rows and 123 columns. 
My ipad 1 struggles to load it and I wondered if the iPad 4 would also struggle. 
I understand the iPad is not primarily designed for spreadsheets, so was wondering what the maximum usable size is that I should be aiming for.
By "usable" I mean to be able to load it in ten seconds or less.
I will also check with my colleagues iPads which are the iPad 4.
Many thanks for your time.

Sun has a number of papers on these topics, ie. for the maximum heap size (http://java.sun.com/performance/reference/whitepapers/tuning.html#section4.1.2).
--olaf                                                                                                                                                                                                                                                                                                                                       

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