Web pages load slowly

A list of problems that cause(d) web pages on my servers to load slowly, and, if available, their solutions.

SESSION variables

A couple months ago, I noticed that my "authenticated" pages loaded more slowly, or not at all, compared to the public pages at http://energyteachers.org . Today, I was programming a page to get information through the server from a previous page, and I discovered the problem was related to session variables.

Now I know to use session_save_path() before declaring a session in PHP so that session variables are stored in my own folder instead of the same folder the hundreds of other sites on my shared server use. The pages went from zero to zippy.

You don't need to know the absolute path, just the relative path from the path you're in, to a tmp folder. To get the path you're in, get the DOCUMENT_ROOT variable from the server. For example: session_save_path($_SERVER['DOCUMENT_ROOT'].'/tmp');