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  1. Qt
  2. QTBUG-60801

QWebEngine: massively slower in 5.7.x

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    Details

    • Type: Bug
    • Status: Closed
    • Priority: Not Evaluated
    • Resolution: Done
    • Affects Version/s: 5.7.1
    • Fix Version/s: 5.9.2
    • Component/s: WebEngine
    • Labels:
      None
    • Environment:
      Windows 7x64
      Visual Studio 2015 (using 2013 runtimes)
      Qt 5.7.1

      Description

      When I upgraded from Qt 5.6.2 to Qt 5.7.1 (I skipped 5.7.0 because of a bug that prevented it from being usable to me) I got a massive slowdown in QWebEngine. Loading of pages, AND rendering, is now significantly slower than before. We're not talking about 2 or 3 times slower. We're talking about 8 to 10 times slower (or so it feels). 

      This is in debug mode.

      This has forced me to compile in Release mode, because that's the only way I get acceptable performance. Release mode now feels 'about the same' as Debug mode felt in Qt 5.6.2, which is disappointing, because I had hoped to get a speedup when switching to Release mode. 

      The worst part of this is that it's not a bit more difficult to debug my application, because I am in Release mode all the time. It's quite simply too painful to use in Debug.

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            Assignee:
            allan.jensen Allan Sandfeld Jensen
            Reporter:
            vern.jensen Vern
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              Updated:
              Resolved:

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