https://bugs.documentfoundation.org/show_bug.cgi?id=90380

            Bug ID: 90380
           Summary: VIEWING:  Navigator causes constant cpu usage when it
                    does not have focus in documents with lots of text
                    frames and images
           Product: LibreOffice
           Version: 4.4.1.2 rc
          Hardware: x86-64 (AMD64)
                OS: Windows (All)
            Status: UNCONFIRMED
          Severity: normal
          Priority: medium
         Component: Writer
          Assignee: libreoffice-bugs@lists.freedesktop.org
          Reporter: gordon1dr...@yahoo.com

Using this document as an example: 
https://wiki.documentfoundation.org/images/2/2f/WG42-WriterGuideLO.odt

Independent Navigator (not in Sidebar, but docked on left):
1. Open Task Manager or Resource Monitor.
2. Open document.
3. Open Navigator.
Note:
There is an initial spike of 25% while the document is loading.
4. Expand Text frames and Images in Navigator.
5. Place cursor in document.
Result:
Cpu usage is 15%.  Scrolling through the document is slow.
6. Click on something in the Navigator.
Result:
Cpu usage drops to anywhere from 1% to 3%.
7. New Text Document or switch to a different application.
Result:
Cpu usage jumps back up to 15%.

Navigator in Sidebar:
1. Open Task Manager or Resource Monitor.
2. Open document.
3. Open Navigator.
Note:
There is an initial spike of 25% while the document is loading.
4. Expand Text frames and Images in Navigator.
5. Place cursor in document.
Result:
Cpu usage is 15%.  Scrolling through the document is slow.
6. Click on something in the Navigator.
Result:
Cpu usage drops to anywhere from 1% to 3%.
7. New Text Document or switch to a different application.
Result:
Cpu usage jumps back up to 15%.
8. Hide Sidebar.
9. Place cursor in document.
Result:
Cpu usage is 15%.

Once Text frames and Images have been expanded, collapsing them does not drop
the cpu usage when the cursor is in the document.  If you collapse these
objects then close and reopen the Navigator, then the cpu usage remains low. 
Hiding the Navigator in the Sidebar is not the same as closing it and still
results in constant cpu usage.

Version: 4.4.1.2
Build ID: 45e2de17089c24a1fa810c8f975a7171ba4cd432

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