QtWebEngine and TranslucentBackground cause high cpu usage when moving the gui

While investigating why my gui was using too much CPU when its being moved i found it was being caused by a combination of:

setAttribute(Qt::WA_TranslucentBackground);

+ qtwebengine

I tried to reproduce it in a smaller project and i have been able to reproduce it randomly  with just:

#include <QtWebEngineWidgets/QWebEngineView>

QtWidgetsApplication::QtWidgetsApplication(QWidget *parent)
    : QMainWindow(parent)
{
    ui.setupUi(this);    
    QWebEngineView* engine = new QWebEngineView(this);  
}

I record a video, its strange that it happens randomly, jump to 1:30:

https://www.youtube.com/watch?v=g57soYDUV0k

Just by moving this simple GUI, it causes a huge CPU usage 10%~.

In some tests i waited some minutes, minimized, resized, etc, but the cpu spike continued.

In my project which contains a lot of widgets it happens 100% of times.

When i move the GUI it causes a high CPU usage 10%~

When i remove the QWebEngineWidget and move the GUI it uses 1~2%

It happens with just a simple:

auto widget = new QWebEngineView(this);

My GUI contains this attribute: 

setAttribute(Qt::WA_TranslucentBackground); 

I noted that when i comment on it, the 'bug' doesn't happen, when i move the GUI containing the same QtWebEngine widgets, it uses 2% compared to 10-12% which the attribute set.

I figured another way to trigger this 'bug' in a smaller project:

QtWidgetsApplication7::QtWidgetsApplication7(QWidget *parent)    : QMainWindow(parent)
{  
  
   ui.setupUi(this);
   setAttribute(Qt::WA_TranslucentBackground);   
   //this->setStyleSheet("background-color: transparent");

   QGridLayout* layout = new QGridLayout(ui.centralWidget);   

   QShortcut *shortcut = new QShortcut(QKeySequence(Qt::Key_F2), this);    connect(shortcut, &QShortcut::activated, [this]   
   {        
        qDebug() << "shortcut";       
        QWebEngineView* engine = new QWebEngineView();       
        QGridLayout* layout = qobject_cast<QGridLayout*>(ui.centralWidget->layout());    
        layout->addWidget(engine); 
   });
}

Just hit F2 and move the GUI around, the CPU spikes to 10%~

https://www.youtube.com/watch?v=qH7mMUf_X0U

I also tested on Windows11, on a secondary machine:

When I add the QWebEngineWidget from 2% it jumps to 20% from just moving the GUI.

https://www.youtube.com/watch?v=IL3MZyK7wtA

In my project when the gui is almost maximized to the entire screen and i move it, sometimes it causes spikes of almost 20% of CPU :/

I have a i9 9900k this is so much CPU for just moving a simple gui.

Whats happening?