Thank you for your suggestion,
1. i tried to "Auto adjust quality", the game automatically changed from Ultra to High quality. mannequins catched me in the end just like in video. may be because my PC specs too low huhuhu will upgrade my PC soon.
2. i tried adjust quality to Low and oh yes its running very smooth! I can accelerate the car faster and escaped! Finally i can sleep in peace hehehehe
Looking forward to your next project :D