Economy of motion: Li's movements are very efficient, and he doesn't waste any unnecessary motion. This helps him to maintain his speed and accuracy.
Relaxed grip: Li holds the pick very loosely, which helps to reduce tension and allows him to move his hand more freely.
Finger independence: Li's fingers are extremely independent, which allows him to play complex fingerings at high speeds.
Practice: Li practices for many hours every day, and he has been playing guitar since he was a child. This has given him the time to develop his technique and skills.
In addition to these technical skills, Li also has a great deal of natural talent and musicality. He is able to combine his technical skills with his musicality to create unique and expressive playing style.