When browsing the chat history, Telegram is browsing two videos at the same time. What optimizations have been made, and the mobile phone is still playing smoothly?

[Aaron009]

Sorry, I'm curious what optimizations Telegram has made for playing videos. I tried it myself and found that when there are multiple videos scrolling the list, there is an obvious sense of freezing when scrolling. But Telegram is smooth, how does it do it.