The _autoload function loads the folder many, the website traffic is big, then to the speed influence big, how should solve

The __autoload function loads the folder many, the website traffic is big, then to the speed influence big?
The __autoload function loads the folder many, the website traffic is big, then to the speed influence big!
function __autoload ($className) {
if (file_exists (' model/'. $className. Class.php ')) {
Include_once (' model/'. $className. Class.php ');
}
if (file_exists (' controller/'. $className. Class.php ')) {
Include_once (' controller/'. $className. Class.php ');
}

$prefix = $GLOBALS [' groupName ']== ' main '? ': '. /';
if (file_exists ($prefix. ' Core/'. $className. Class.php ')) {
Include_once ($prefix. ' Core/'. $className. Class.php ');
}
if (file_exists ($prefix. ' core/smarty-3.1.6/'. $className. Class.php ')) {
Include_once ($prefix. ' core/smarty-3.1.6/'. $className. Class.php ');
}
if (file_exists ($prefix. ' core/smarty-3.1.6/sysplugins/'. $className. php ')) {
Include_once ($prefix. ' core/smarty-3.1.6/sysplugins/'. $className. php ');
}

}

------Solution--------------------
I don't think it's much of a __autoload, because it's just a call to __autoload to load multiple files instead of calling __autoload multiple times to load several files.

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