The web is stateless, but often the apps we build are not. To facilitate state in web apps, PHP provides a session handling mechanism. Sessions are off by default, and enabled with the `session_start()` function. Read more about PHP session handling at https://www.php.net/manual/en/book.session.php If you have worked with PHP sessions before you may have noticed performance issues

Here at Mindsize, the performance of your online store is of the highest priority to us. We employ several methods of monitoring performance and gathering metrics. I want to highlight one method that gives us insight into the number of queries running on your MySQL database server. It is useful on a single site, and