<?php
class WebApplicationsController extends AppController {
    public $components = array(
        'Session',
    );
    public $lazyComponents = array(
        'Heavy',
    );
 
    public function heavy() {
        $x = $this->Heavy->getHeavy();
    }
}

<?php
class AppController extends Controller {
    // コンポーネントの遅延ローディング
    public function __get($name) {
        if (isset($this->lazyComponents)) {
            $components = ComponentCollection::normalizeObjectArray($this->lazyComponents);
            if (in_array($name, array_keys($components))) {
                $this->log('try lazy loading.' . $name, 'debug');
                $this->{$name} = $this->Components->load($name, $components[$name]);
                $this->{$name}->initialize($this);
                $this->{$name}->startup($this);
                $this->log('complete lazy loading.' . $name, 'debug');
                return $this->{$name};
            }
        }
        return parent::__get($name);
    }
}