_ How can I solve this problem if the autoload function loads many folders and the website traffic is heavy?

The _ autoload function loads many folders, and the website traffic is heavy. does it affect the speed? _ the autoload function loads many folders, and the website traffic is heavy, does it significantly affect the speed! Function _ autoload ($ className) {if (file_exists ('Model/'. $ cl _ autoload function loads a large number of folders, and the website traffic is heavy. does it significantly affect the speed?
_ The autoload function loads many folders, and the website traffic is heavy. does this affect the speed!
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 --------------------
In my opinion, using _ autoload has little impact, because it only calls _ autoload to load multiple files at a time, rather than calling _ autoload to load multiple files multiple times.