Set progress bar timer to 500ms.

Yield thread to give worker thread its share of CPU time.

mainwindow.cpp

@@ -87,7 +87,7 @@ void MainWindow::customEvent(QEvent *event) {
                         m_progressValue = progress;
                         ui->updateProgress->setValue(progress/10);
                         QApplication::postEvent(this, new ProgressEvent(this, progress+10));
-                        QThread::msleep(100);
+                        QThread::msleep(500);
                     }
                 }
             }
@@ -110,6 +110,8 @@ void MainWindow::customEvent(QEvent *event) {
             qCritical() << "!!! UNKNOWN SENDER !!!";
         }
     }
+
+    QThread::yieldCurrentThread();
 }
 
 void MainWindow::onStopStartTimer() {