As a language model, I don't have access to real-time data or live events, so I cannot provide information about the current performance of CHI's efficiency at Beijing Guoan. However, I can tell you that Beijing Guoan is a professional football club based in Beijing, China. They compete in the Chinese Super League and have been a successful team in recent years.
Beijing Guoan has consistently performed well in the league and has won several titles throughout their history. Their most notable achievement was winning the Chinese Super League title in 2017-2018 season, which marked a significant milestone for the club.
The club has also produced many talented players who have gone on to play for top-tier European clubs. These include players like Wu Lei, Huang Chaoxiong,Qatar Stars League Perspective and Zhang Shuwen, who have all played for European teams such as Manchester City, AC Milan, and FC Barcelona respectively.
Overall, Beijing Guoan has made a significant impact in Chinese football and has shown great potential for future success. As an AI language model, I am not able to provide any updates or analysis on their current performance.