[Libreoffice-bugs] [Bug 133856] ODT file developed in .NET take 8-10 minutes to open in LO Writer as compared to Word just take few seconds

[bugzilla-daemon at bugs.documentfoundation.org]

https://bugs.documentfoundation.org/show_bug.cgi?id=133856

--- Comment #6 from Regina Henschel <rb.henschel at t-online.de> ---
Created attachment 164158
  --> https://bugs.documentfoundation.org/attachment.cgi?id=164158&action=edit
Document opened with Word 365 and resaved in ODF format

The validator shows three error.
1) root: The file 'mimetype' shall not be compressed in the ODF package 'LO
133856 newDOC.odt'!
2) manifest.xml: element "manifest:manifest" is missing "version" attribute
3) content.xml: element "office:document-content" is missing "version"
attribute

Error 2) exists in the resaved document too and is ignored by LibreOffice.
Errors 1) and 3) are removed by Word.

The resaved file opens in LibreOffice.

The file has one table with 7 columns and 4470 rows ! That results in one table
covering 338 pages.

There is indeed a problem with such large tables. First opening does not get
the correct number of pages. Switching to Web view and back to Normal view
brings the correct number.

Word opens it quickly, but that is misleading. It prepares the first page to
show it to the user and you will see delay when scrolling through the document.
I don't now for sure, but I think, LibreOffice first goes through all pages and
then presents it to the user.

So there are three problems:
LibreOffice should be more tolerant with packing errors and version attribute
errors.
We should re-think about the opening process, and consider showing preliminary
results to the user.
LibreOffice needs better performance with large tables. Bug 132206, bug 126788
and bug 125171 might be related.

[I have not yet tried to open the original file, that will follow.]

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