Now the playback window is capable of vastly quicker sending of frames.

Use the burst setting and crank it up. Set the time interval to around 2ms and the burst to 6 and you'll be slinging frames like crazy.

frameplaybackwindow.h

@@ -55,11 +55,13 @@ private slots:
 
 signals:
     void sendCANFrame(const CANFrame *, int);
+    void sendFrameBatch(const QList<CANFrame> *);
 
 private:
     Ui::FramePlaybackWindow *ui;
     QList<int> foundID;
     QList<CANFrame> frameCache;
+    QList<CANFrame> sendingBuffer;
     const QVector<CANFrame> *modelFrames;
     int currentPosition;
     QTimer *playbackTimer;