https://issues.apache.org/bugzilla/show_bug.cgi?id=47405

--- Comment #1 from Per Lewau <[email protected]> 2010-12-01 08:04:01 EST ---
Created an attachment (id=26362)
 --> (https://issues.apache.org/bugzilla/attachment.cgi?id=26362)
A patch to speed up serialization

I have also had this very problem with the Poi trunk. I used Alexander's
approach and that produces a great speedup. It is still worse than O(N) but
it's a lot better than the original version (3.5 to .8 seconds). Serializing
Excel ought to be O(N) where N is the total number of rows, but I'll admit I
know nothing about the Excel file format.

I have attached a patch against Poi 3.7 that implements Alexander's approach.
In addition to his version I discard the values list when the map is modified.

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