在Laravel中通过PHP提供图像的最佳方式是什么？

What is the best way to load images via a controller in laravel

Hey Everyone, I'm working on a function to save all images from an external source, to reduce their size and eventually show them again via a new link. Everything works perfectly, only I asked myself if it was possible to load the images faster from the Laravel application. The moment I load it from the external source it takes 60 milliseconds and when it is loaded from the Laravel application 400 milliseconds.

public function index($id)
{
    $filelocation = 'img/';

    if (file_exists($filelocation . '' . $id)) {
        $im = file_get_contents($filelocation . '' . $id);
        header('content-type: image');
        echo $im;
    } else {

        define('WEBSERVICE', 'http://api.resmush.it/ws.php?img=');
        $s = 'http://www.example.com/hires/' . $id;
        $o = json_decode(file_get_contents(WEBSERVICE . $s));

        if (isset($o->error)) {
            die('Error');
        }
        $ch = curl_init($o->dest);
        $fp = fopen($filelocation . '' . $id, 'wb');
        curl_setopt($ch, CURLOPT_FILE, $fp);
        curl_setopt($ch, CURLOPT_HEADER, 0);
        curl_exec($ch);
        curl_close($ch);
        fclose($fp);
        // Load image
        $im = file_get_contents($filelocation . '' . $id);
        header('content-type: image');
        echo $im;

    }

Is there a good way to speed up the application, without using a more powerful server? (

All feedback is welcome :)