Department manager hold a meeting in the morning suddenly, all of the team lead and technology lead joined this meeting. He was speaking serious about the problems which happen recently, and called the roll that who's fault leaded to the problems happened. He asked we should pay attention to our work, and not treat it only as a task, should treat as our cause, and do our best to finish it. The stupid mistake should not happen again, when we find the mistake should resolve it as soon as possible, especially the mistake will lead to lose the user. After department manager said that, I think I should begin the process to optimize the memory used in our software.