<![CDATA[webengineview will cause performance degradation?]]>I use QT 5.12.3 in windows 10
I put some widgets in mdiArea by using mdi->addsubwindow(widges)
if one of the widgets contains webengineview widget, all the widgets in mdiArea will have a delay to move when I drag their title bars.
if I delete the webengineview in a widget, there will be no delay for all widgets when I try to move them.

]]>https://forum.qt.io/topic/102455/webengineview-will-cause-performance-degradationRSS for NodeTue, 07 Apr 2026 08:26:05 GMTSun, 05 May 2019 05:26:33 GMT60<![CDATA[Reply to webengineview will cause performance degradation? on Mon, 06 May 2019 02:54:11 GMT]]>I tried your code, and it lags.
the attachment is my project (testmdi.rar) and I take a short video (mdi_with_webengine.mp4) to show how it lags.
As a comparison, the video named 'mdi_demo_by_qt.mp4' is generated using the QT demo 'MDI Example' in Qt 5.12.3 MSVC2017 32 bit.
In mdi_demo_by_qt.mp4, I think it doesn't lag, but in mdi_with_webengine.mp4, it lags
As I cannot upload file, I put them in my github 'https://github.com/divid54/qt_project/tree/master/testmdi'
thanks a lot

]]>https://forum.qt.io/post/527220https://forum.qt.io/post/527220Mon, 06 May 2019 02:54:11 GMT<![CDATA[Reply to webengineview will cause performance degradation? on Sun, 05 May 2019 14:31:42 GMT]]>Hi
I tried with
auto m_webView = new QWebEngineView;
m_webView->resize(100,100);
auto it = ui->mdiArea->addSubWindow(m_webView );
it->resize(100,100);
it->show();

and did get any lag even i made several of them.

Could you try same code ?
Only difference is there is no layout.

]]>https://forum.qt.io/post/527149https://forum.qt.io/post/527149Sun, 05 May 2019 14:31:42 GMT<![CDATA[Reply to webengineview will cause performance degradation? on Sun, 05 May 2019 12:18:58 GMT]]>@mrjj I just tried, it doesn't lag if use in MainWindow, so there is something with MDI windows. thats odd, if I comment the line // ui->verticalLayout_webFrame->addWidget(m_webView);
it doesn't lag, but it lags (the mouse will go outof the title bar some distance and then the widget starts to move) if this line is added.
how can I make further checks? thanks a lot

]]>https://forum.qt.io/post/527139https://forum.qt.io/post/527139Sun, 05 May 2019 12:18:58 GMT<![CDATA[Reply to webengineview will cause performance degradation? on Sun, 05 May 2019 12:02:33 GMT]]>@johnson54
ok. thats a bit odd.
Should not be that heavy.
If you just use it in a MainWindow, its also lags ?
Could be something with MDI windows.

]]>https://forum.qt.io/post/527133https://forum.qt.io/post/527133Sun, 05 May 2019 12:02:33 GMT<![CDATA[Reply to webengineview will cause performance degradation? on Sun, 05 May 2019 11:52:19 GMT]]>@mrjj yeah, I just new a QWebEngineView like this:
m_webView = new QWebEngineView;
ui->verticalLayout_webFrame->addWidget(m_webView);
it will cause the delay for movement.

]]>https://forum.qt.io/post/527132https://forum.qt.io/post/527132Sun, 05 May 2019 11:52:19 GMT<![CDATA[Reply to webengineview will cause performance degradation? on Sun, 05 May 2019 08:19:37 GMT]]>Hi
So you dont even load a page to the webengineview ?

]]>https://forum.qt.io/post/527108https://forum.qt.io/post/527108Sun, 05 May 2019 08:19:37 GMT<![CDATA[Reply to webengineview will cause performance degradation? on Sun, 05 May 2019 05:36:35 GMT]]>I just promote the widget to webengineview and nothing is done

]]>https://forum.qt.io/post/527085https://forum.qt.io/post/527085Sun, 05 May 2019 05:36:35 GMT