Bug 53588 - Open document file preview will block windows explorer for several seconds everytime a document is selected
Summary: Open document file preview will block windows explorer for several seconds ev...
Alias: None
Product: LibreOffice
Classification: Unclassified
Component: LibreOffice (show other bugs)
(earliest affected) release
Hardware: x86 (IA32) Windows (All)
: medium critical
Assignee: Not Assigned
Whiteboard: target:3.7.0 target:3.6.2
: 54249 (view as bug list)
Depends on:
Blocks: mab3.6
  Show dependency treegraph
Reported: 2012-08-16 11:54 UTC by bureautiquelibre
Modified: 2013-11-16 12:40 UTC (History)
11 users (show)

See Also:
Crash report or crash signature:

Test document for preview (260.18 KB, application/vnd.oasis.opendocument.presentation)
2012-10-05 14:53 UTC, bureautiquelibre

Note You need to log in before you can comment on or make changes to this bug.
Description bureautiquelibre 2012-08-16 11:54:19 UTC
File preview blocks any other operation in the file explorer during several seconds.

This occurs everytime a LibreOffice document is selected, no other operation (like opening the document or selecting another file for example) can be done until the preview is displayed.

Happens only with open document format.
Comment 1 Thomas Thym 2012-08-16 12:52:35 UTC
I can confirm this bug. In my case Explorer is hanging several minutes not only seconds. (Windows XP, LO

This bug might be related to: 
Comment 2 Olivier R. 2012-08-26 10:41:00 UTC
I also confirm.
It’s related to the explorer extension.

Unselect it at installation and it should work properly again.

Explorer extension is very slow on Windows and may crash the explorer if you select a big file (several Mb).
Comment 3 Pierre C 2012-08-28 11:31:15 UTC
I can confirm this bug on my two computers (seven, x64)

on my notebook, explorer process take over 100 % of cpu usage, and the two cores are working at 100 % thus the computer is unusable

on my desktop computer, explorer process is at 50 % and only two of the four cores are working at 100 %, so the computer is still usable.

the cpu usage stops only when restarting the computer or killing explorer process

imho, most user on windows have a quad core, and so the bug could stay hidden. the computer, is slow but usable, and you can't delete come file but no more afaiks 

Comment 4 Michel Rudelle 2012-09-07 07:35:03 UTC
I confirm and add another consequence:
It is not possible any more to rename an ODF file by using windows explorer
(on Vista and seven)
Comment 5 Michel Rudelle 2012-09-07 07:40:48 UTC
(In reply to comment #4)
> I confirm and add another consequence:
> It is not possible any more to rename an ODF file by using windows explorer
> (on Vista and seven)

Sorry, I forgot to mention that this happens only on large files (ie 9 Mo)
Comment 6 Olivier R. 2012-09-07 17:19:41 UTC
According to this page (http://wiki.documentfoundation.org/Release_Criteria), this bug is a blocker, as it may freeze or crash the Windows explorer.
Comment 7 manj_k 2012-09-07 19:37:47 UTC
*** Bug 54249 has been marked as a duplicate of this bug. ***
Comment 8 Jean-Baptiste Faure 2012-09-08 05:43:32 UTC
Seems to be a duplicate of bug 53533 which is fixed in LO
Fridrich: please, can you confirm ?
Comment 9 Petr Mladek 2012-09-10 16:48:05 UTC
OK, it might have been fixes as the bug #53533. Could anyone try to verify it using the daily build from 

I agree that it is very annoying and we need to fix it ASAP. On the other hand, there exists a workaround to do not install the extension => it can't block the next release => lowering the severity a bit
Comment 10 Andras Timar 2012-09-11 10:46:40 UTC
According to my tests, the patch below increases speed of search times dramatically. I set this bug as RESOLVED FIXED, please reopen, if you still experience slowdowns.
Comment 11 Andras Timar 2012-09-11 13:55:53 UTC
I don't know what's wrong with the bot, FYI this is the commit:
Comment 12 bureautiquelibre 2012-09-17 09:53:14 UTC
Re-tested with LibreOffice 3.6.2 + win XP, still have the problem with .odp files.
Blocks the explorer on network drives, extremely slow on local drives.

Seems to work file with writer & calc files.
Comment 13 Andras Timar 2012-09-17 10:36:53 UTC
(In reply to comment #12)
> Re-tested with LibreOffice 3.6.2 + win XP, still have the problem with .odp
> files.
Could you please attach a few sample documents, or if they too large upload them somewhere (e.g. to Dropbox)? It is fast with our test documents. Thanks!
Comment 14 bureautiquelibre 2012-10-05 14:53:58 UTC
Created attachment 68120 [details]
Test document for preview
Comment 15 bureautiquelibre 2012-10-05 15:14:57 UTC
I think I was mistaken by the version number, it probably was on my PC at the time I reopened the bug since it doesn't block the explorer for a very long time anymore. I'll be more careful about that next time.

I added a test document, it blocks the file explorer for about 3 seconds with v3.6.2 if I try to preview it on a network drive, which not very fast but acceptable. It's rendered instantly on a local drive, so it's not the processing time that seems to matter.

The preview seems to generate a huge number of requests to the file server during those 3 seconds, that could explain the delay.

Eric Ficheux
Comment 16 Andras Timar 2012-10-05 15:22:06 UTC
Fair enough. I mark this RESOLVED FIXED again. Just FYI, for the preview we need to find the thumbnail image in the document, which is a zip archive. Reading zip was significantly accelerated in 3.6.2, because the program now looks for the central zip directory in the last 1024 bytes of the file instead of reading the whole file.
Comment 17 Mathieu Parent 2012-10-15 15:52:33 UTC
Proposal for improvements: #56007