https://bugs.documentfoundation.org/show_bug.cgi?id=94184

            Bug ID: 94184
           Summary: Automatic spell checking makes Writer unresponsive for
                    ~2min
           Product: LibreOffice
           Version: 5.0.1.2 release
          Hardware: x86 (IA32)
                OS: Linux (All)
            Status: UNCONFIRMED
          Severity: normal
          Priority: medium
         Component: Writer
          Assignee: libreoffice-bugs@lists.freedesktop.org
          Reporter: remi.me...@gmail.com

Created attachment 118663
  --> https://bugs.documentfoundation.org/attachment.cgi?id=118663&action=edit
slow document

I have a document with 65 labels on a page (see attachment). It already has too
many images that are pretty large and that make it hard to work with in Writer.
There is not a lot of text, which is why I find it strange that automatic spell
checking blocks Writer for 2-3min.

Steps to reproduce:
1) Open document with automatic spell checking enabled
2) Wait and see how spell checking adds wiggly lines to words in a frequency of
around 1 per second while making Writer completely unresponsive.

Less extreme but still visible:
Steps to reproduce:
1) Disable automatic spell checking
2) Open document (it is slow but usable)
3) Enable automatic spell checking -> Writer is unresponsive for 1 minute while
it checks for spelling mistakes

The PC this runs on is rather old but handles the document before and after
spell checking, but is completely overloaded while spell checking is in
progress. I actually think the reason is more in rendering the wiggly lines
that may trigger re-rendering of the whole view(?). Still, the performance in
this case requires me to disable spell checking completely, which I think
should never be necessary. Re-rendering every ~10s instead of every word may be
the better approach if rendering is the actual cause.

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