Log files on your hosting system are a good indicator of what is going wrong if you have a problem with long loading times. Look at the error.log files to find out if there are any problems with your site; you might even notice some attempts to hack your web site. Therefore, it's a good idea to do these checks at least once in a month, or instantly if you encounter a problem.

Error log files are sometimes difficult to read. With practice you will come to know the biggest problems very quickly. Reading log files can show you that the path to your favicon.ico is not what you expected it to be. It might also show you that a certain image is missing in your template directory. Both problems can slow down your page's loading time, as the browser will try to find the missing file, thereby going through the process of error handling. Eliminating the problems by providing the expected files can make a large impact on your site's performance.