Performance improvements

Hello,

I’m noticing a performance hit with this plugin due to the amount of file_exists checks coming from the autoloader (social-warfare/lib/Social_Warfare.php:572 and social-warfare-pro/lib/Social_Warfare_Pro.php:149 for the pro version).

The spl_autoload_register function is loading all of the classes on a site which results in thousands of file_exists checks on large sites, affecting performance.

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

spl_autoload_register( function( $class_name ) use ($path) {

if (strpos($class_name, 'SWP_') === false) {
return;
}