#include <QApplication>
#include <QDialog>
#include <QOpenGLWidget>
#include <QLayout>
#include <QTimer>

class GLDialog : public QDialog
{
public:
    GLDialog()
    {
        QOpenGLWidget *glw = new QOpenGLWidget;
        QVBoxLayout *layout = new QVBoxLayout;
        layout->addWidget(glw);
        setLayout(layout);
        setGeometry(64, 64, 1024, 768);
    }
};

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);

    quint64 count = 0;
    QTimer timer;
    timer.setSingleShot(false);
    timer.setInterval(100);

    QDialog makeTheAppNotQuit(NULL, Qt::Window);
    makeTheAppNotQuit.show();

    QObject::connect(&timer, &QTimer::timeout, [&timer, &count]
    {
        count++;
        if(count % 50 == 0) timer.setInterval(5000); // Give us some time to take a look at the memory usage
        else timer.setInterval(100);

        GLDialog *dlg = new GLDialog;
        dlg->show();
        delete dlg;
    });

    timer.start();

    return a.exec();
}