Preferences loss in mac

Preferences loss in mac: To solve the problem that mysql cannot be started, uninstall and reinstall mysql. When uninstalling, some files in Preferences are deleted. Today, after turning on the computer, you will find that, my sogou PinYin Input Method disappears, and the desktop background is replaced. All of these can be understood to be useful, but what I can't bear is that the mac response speed is very slow, even QQ cannot run smoothly, but you have to open the terminal and run: Java code ps aux found that a process coreaudiod has never been seen before. Then, after running Java code top, I found that this process actually accounts for 80 ~ Of My cpu ~ 98%. You have no choice but to run the Java code kill-9 pid. I found that the process was restarted again, but it was still running with a high cpu usage. google said it was a duplicate of com. apple. audio. systemSettings. plist (/Libarary/Audio), but I found that my Libarary directory does not have the Audio folder at all. I suspect that I deleted it by mistake when I downloaded the database yesterday, so I copied an Audio folder from my colleague's mac and put it in my Preferences directory. Then I restarted my computer and ran normally. It is quite simple to solve this problem, but the ideas for solving the problem are still very rewarding. Conclusion: When we find that the computer is running slowly, we should first look at why it is running so slowly, and see which processes are running on the computer and which processes we have never seen before, then we will focus on these processes and check the cpu usage of these processes on the computer. For processes with a particularly high cpu usage, we will study what the process is doing, why does this action occupy resources and find a solution.