[jopendocument] It's very slow when I use Jopendocument to load ods,

[booster]

I'm a java developer and I use Jopendocument's jar for my work, but I found 
it very quick when I parse the file saved by libreoffice. Very slow when I 
use files saved by Microsoft Excel, I use the following API.
    SpreadSheet document = SpreadSheet .createFromFile(file);
     Int count = document.getSheetCount();
     For (int i = 0; i < count; i++) {
     Sheet sheet = document.getSheet(i);
 }

Can someone give me some advice? I will be extremely grateful.

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