聊天类app UITableView 比如一秒接受到1000条信息 ，reloadData怎么提高性能？
If you receive 1,000 messages in one second, do you have to display 1,000 messages?
Display the latest 20 items, and add the rest when more are loaded
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If you receive 1,000 messages in one second, do you have to display 1,000 messages?
Display the latest 20 items, and add the rest when more are loaded