We cannot troubleshoot any issue by just referring to the user comments or problem statement. In order to troubleshoot the issue, we have to narrow down the problem to its root level and fix the issue.
Many web administrators always ask this question; how do we know that the system has a particular problem?
The solution to these issues will be found, if you dig the problem in the correct path. Secondly, if you come across a number of problems in your career, then you can correlate them and solve the problem. If you ask me, practically it's impossible to teach troubleshooting, as it comes from your own experience and your interest to solve the problem. Here, we discuss one of the common problems, application slowness, that occurs in every environment and the web administrator has to face this problem in his/her career.