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qt5.15.2 QWebEngineView is slow, QWebEnginePage's print function is very slow.



  • Environment:
    QT 5.15.2 MSVC2019 32bit
    OS: window 10

    Reproduce steps:

    1. Open the printme exmaple,replace local html file with remote url (https://github.com/marketplace)

    main.cpp

    int main(int argc, char *argv[])
    {
        QCoreApplication::setAttribute(Qt::AA_EnableHighDpiScaling);
        QApplication app(argc, argv);
    
        QWebEngineView view;
    
    ////////////////////////////////// modification: 
    //    view.setUrl(QUrl(QStringLiteral("qrc:/index.html"))); 
        view.setUrl(QUrl("https://github.com/marketplace"));
    ////////////////////////////////
    
        view.resize(1024, 750);
        view.show();
    
        PrintHandler handler;
        handler.setPage(view.page());
    
        auto printPreviewShortCut = new QShortcut(QKeySequence(Qt::CTRL + Qt::Key_P), &view);
        auto printShortCut = new QShortcut(QKeySequence(Qt::CTRL + Qt::SHIFT + Qt::Key_P), &view);
    
        QObject::connect(printPreviewShortCut, &QShortcut::activated, &handler, &PrintHandler::printPreview);
        QObject::connect(printShortCut, &QShortcut::activated, &handler, &PrintHandler::print);
    
        return app.exec();
    }
    
    1. build and run printme,it's slower to open the remote url. Press CTRL + P to preview the page to print,it takes 9-20 seconds, very slow. We tried QT5.9 to build and run printme example, it's very fast to open url, preview page to print.


  • well, QT5.15.0 is fast, finally we choose QT5.15.0


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