QWebEngineView slow while resizing

Ediolot

I have not seen many people having this problem, but I have found this issue which makes my desktop application feel slow.

After adding a QWebView widget to the main layout of the main window and loading the html code, if I resize the window, the contents of the QWebView seem to be lagging while resizing. See the video: https://streamable.com/58i25

This is the relevant code:

MainWindow::MainWindow(QWidget *parent)
    : QMainWindow(parent)
    , ui(new Ui::MainWindow)
    , webInterface(new QWebEngineView(this))
{
    ui->setupUi(this);
    ui->gridLayout->addWidget(webInterface);
    webInterface->setUrl(QUrl(HTML_RESOURCE));
}

I have also tried adding:

    webInterface->setAttribute( Qt::WA_OpaquePaintEvent, true );
    webInterface->setAttribute( Qt::WA_PaintOnScreen, true );
    webInterface->setAttribute( Qt::WA_DontCreateNativeAncestors, true );
    webInterface->setAttribute( Qt::WA_NativeWindow, true );
    webInterface->setAttribute( Qt::WA_NoSystemBackground, true );
    webInterface->setAutoFillBackground( false );

In the .pro file:

QT       += core gui webenginewidgets

greaterThan(QT_MAJOR_VERSION, 4): QT += widgets

TARGET = TEST_APP
TEMPLATE = app
CONFIG += c++11

This happens in Debug and Release. The program seems to be also consuming "a lot of" CPU while I'm resizing the window (Around 16%).

Im using:
Microsoft Windows 10 Pro N (10.0.17134 Build 17134)
Intel Core i7-6700
Nvidia GeForce GTX 650 Ti
Qt 5.10.1 MSVC2017 64bit
Qt Creator 4.6.0-rc1 (4.5.83)

Is there any solution to this problem ? I did also found this issue in github which may suggest there is not.

theFront

Thanks for solve my problem.
My app feel a lot quick with use setAttribute( Qt::WA_NativeWindow, true );

jakobtroidl

Hi ediolot,

have you solved this problem in the meantime? I have the same issue.

Best, Jakob