Memory leaks when using insert function, even with destroy.

while (true) { // use while-true to simulate lots of images
    foreach (Storage::files('tmp') as $file) {
        echo $file, "\n";
        $image = Image::make(storage_path('app/' . $file));
        // $img = Image::make(storage_path('app/' . $file));
        $img = clone($image);
        $img->crop(200, 100);
        // $this->some($img);
        $image->insert($img);
        $image->save(storage_path('tmp.png')); // without this save, grows much slower. It is another encode leaks issue I think.
        $img->destroy(); // without these two destroy, script booms very quickly.
        $image->destroy();
        usleep(25);
    }
}