What is the TPS of the Bitcoin system? What are the existing methods or ideas for improving the TPS ?? Seeking the big guys to help me answer it, especially in a hurry!

TPS, popular definition, is "system throughput". A professional explanation is "the number of business that can be handled per second". It is estimated that most people's understanding is here. However, this is a very superficial understanding. It is almost meaningless for the value of the verification, and even a negative effect! Now some improvement of TPS technology has side chain technology and sharding technology. I am Xiaoju to focus on the blockchain field