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List:       calligra-devel
Subject:    Re: Words and large files
From:       Jos van den Oever <jos () vandenoever ! info>
Date:       2021-03-22 16:43:49
Message-ID: 7736435.eFmWaWnqpD () l390
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On maandag 22 maart 2021 14:18:32 CET Pierre wrote:
> So… firing up perf record and hotspot, with OpenDocument spec 1.2 (that's
> what I found in my homedir)…

I had it in Downloads/OpenDocument-v1.2-part1.odt ;-)

For comparison: this one loads faster
  https://webodf.org/demo/ci/wodotexteditor-0.5.9/localeditor.html
but is unmaintained and does no pagination.

> It takes about 21s to load, of which 34% is spent parsing the document (7s,
> still too much, but let's accept it so far) and 59% of the time is spent
> layouting.
> 
> 14% of time is spent in KoTextRange::document() from
> KoTextRangeManager::textRangesChangingWithin. I've optimized this to remove
> this call to document, but I gained only 1s.
> I've done another minor optimization and found on my way that having private
> classes embedded in std::unique_ptr kills performance, but this will
> deserve a message on its own.
> 
> Since the fastest code is the one we don't call, I've written a completely
> different way that doesn't call textRangesChangingWithin anymore. Much
> faster since I'm now down to 15s.

It's faster than Abiword.

After OpenDocument-v1.2-part1.odt was loaded doing ctrl-a <del> is fast. Only 
Calligra is fast at that. Undo after deleting all contents takes quite some 
seconds. But still fairly good. Certainly compared to LO, WebODF and Abiword.

⤳Jos

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