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Here is a table of loading times (in seconds)
This test was carried out under Windows XP SP3 with the 300.000 lines sample
I mentioned in a previous post, converted to the 4 formats. 

(NOTES: * LO/OOo only loads CSV files after a screen asking for
encoding/delimiters; ** I'm not surprised that MS doesn't support .gnumeric
but I think LO/OOo should)

Notice that LO/OOo takes 4 times longer to load an ODS file than Gnumeric
and 24(!!!) times longer to load the xlsx file than Excel and Gnumeric.

Interestingly, ODS is also the slowest format to load in Gnumeric.

These results show that some optimization is needed for both LO/OOo and the
ODS format...

(Loading ODS in Office 2007 used the latest version of the OpenXML/ODF
Translator Add-in for Office
No comments on the loading time :) )

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