title: How to improve performance on codeigniter
body: <p>I have a program written with Codeigniter which turns out to be very slow when logging out.</p>
  
  <p>When I debug the program, I realize that there is a step that lasts for 10 s</p>
  
  <blockquote>
    <p>Session: Class initialized using 'files' driver</p>
  </blockquote>
  
  <p>here is the complete debug</p>
  
  <pre><code>INFO - 2017-09-20 12:56:05 --&gt; Config Class Initialized
  INFO - 2017-09-20 12:56:05 --&gt; Hooks Class Initialized
  DEBUG - 2017-09-20 12:56:05 --&gt; UTF-8 Support Enabled
  INFO - 2017-09-20 12:56:05 --&gt; Utf8 Class Initialized
  INFO - 2017-09-20 12:56:05 --&gt; URI Class Initialized
  INFO - 2017-09-20 12:56:05 --&gt; Router Class Initialized
  INFO - 2017-09-20 12:56:05 --&gt; Output Class Initialized
  INFO - 2017-09-20 12:56:06 --&gt; Security Class Initialized
  DEBUG - 2017-09-20 12:56:06 --&gt; Global POST, GET and COOKIE data sanitized
  INFO - 2017-09-20 12:56:06 --&gt; Input Class Initialized
  INFO - 2017-09-20 12:56:06 --&gt; Language Class Initialized
  INFO - 2017-09-20 12:56:06 --&gt; Loader Class Initialized
  INFO - 2017-09-20 12:56:06 --&gt; Helper loaded: url_helper
  INFO - 2017-09-20 12:56:06 --&gt; Controller Class Initialized
  INFO - 2017-09-20 12:56:06 --&gt; Database Driver Class Initialized
  INFO - 2017-09-20 12:56:06 --&gt; Helper loaded: string_helper
  INFO - 2017-09-20 12:56:06 --&gt; Helper loaded: form_helper
  INFO - 2017-09-20 12:56:06 --&gt; Helper loaded: language_helper
  DEBUG - 2017-09-20 12:56:06 --&gt; Session: "sess_save_path" is empty; using "session.save_path" value from php.ini.
  INFO - 2017-09-20 12:56:06 --&gt; Session: Class initialized using 'files' driver.
  INFO - 2017-09-20 12:56:16 --&gt; Language file loaded: language/french/messages_lang.php
  INFO - 2017-09-20 12:56:16 --&gt; File loaded: C:\wamp\www\SESAME\application\views\template/header.php
  INFO - 2017-09-20 12:56:16 --&gt; File loaded: C:\wamp\www\SESAME\application\views\connect_user.php
  INFO - 2017-09-20 12:56:16 --&gt; File loaded: C:\wamp\www\SESAME\application\views\template/footer.php
  INFO - 2017-09-20 12:56:16 --&gt; Final output sent to browser
  DEBUG - 2017-09-20 12:56:16 --&gt; Total execution time: 10.8679
  </code></pre>
  
  <p>Can you help me find the cause of this low performance?</p>