This PHP extension currently adds C implementations to the frequently used check_plain and drupal_static Drupal functions.
It is still experimental and it should not be used in production until you've thoroughly tested it. It has only been tested to work with PHP 5.3.2, however, it should work with PHP 5.2 as well. Test with a new Drupal installation first. If something goes wrong with drupal_static, you should know it right away, since Drupal will break if it's malfunctioning.
INSTALLATION:

1. Download, extract, and run phpize in the extension's directory.
2. Run ./configure;make;make test
   
   If all tests passed then proceed by running make install.
3. Comment out the check_plain and drupal_static functions in includes/bootstrap.inc in Drupal's directory.
   
   *do not* comment out the drupal_static_reset() function.
4. Restart your web server for the changes to take effect.