Performance improvements

Hello,

I’m noticing a performance hit with this plugin due to the amount of file_exists checks coming from the autoloader (peepso-core/peepso.php line #2736)

The autoload function is called via spl_autoload_register which is loads all of the classes on a site. This can result in thousands of file_exists checks for large sites, which affects backend performance.

Is it possible for a condition to be added, such as below, to drop any non-peepso classes before the file_exists check?

public function autoload($class)
    {

	if (strpos($class, 'peepso') === false) {
    	return;
    }