qt界面切换会出现卡顿

[weixin_38218450]

大神们好，我是这样写的，但是放到arm板上去测试，先点击主界面的按钮，然后停顿一下才刷新界面，才会出现music_wid 这个界面，大概有一秒的时间，请问怎么解决这个问题

void MainWindow::slot_funbtn()
{
int index=sender()->objectName().toInt();
music_wid = new Music;
connect(music_wid->top_widget->m_btnexit,SIGNAL(clicked(bool)),this,SLOT(slot_return()));
music_wid->show();

QTime dieTime = QTime::currentTime().addMSecs(5);
while( QTime::currentTime() < dieTime )
QCoreApplication::processEvents(QEventLoop::AllEvents, 50);

this->hide();

}
void MainWindow::slot_return()
{
this->show();
QTime dieTime = QTime::currentTime().addMSecs(5);
while( QTime::currentTime() < dieTime )
QCoreApplication::processEvents(QEventLoop::AllEvents, 50);
music_wid->close();

}

[zhxianbin]

music_wid = new Music; 放到构造函数中，定时器超时不要 close 掉、hide