How do QR codes speed up bitcoin payments?

Can you explain how QR codes facilitate faster Bitcoin payments? I'm curious about the technical processes involved in scanning a QR code and how it streamlines the transaction process. Does it bypass any traditional banking intermediaries or does it simply provide a more convenient way to input payment details? How does the security of QR code-based payments compare to traditional payment methods, and are there any specific precautions users should take when using QR codes for bitcoin transactions?