Deepstream 6.0.1, objectorDectctor_Yolo

I tested deepstream objectorDectctor_Yolo using built-in yolov3.cfg and yolov3.weights. And I get around 4 fps. It is normal? 4 fps is so bad, right? I want to know that can I get better performance (example around 30 fps)?

Platform:
jetson nano