Need faster function - help :(

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This is the function I use to return the filesize of a remote image.

function ffilesize($file){
    $ch = curl_init($file);
    curl_setopt($ch, CURLOPT_NOBODY, true);
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
    curl_setopt($ch, CURLOPT_HEADER, true);
    $data = curl_exec($ch);
    curl_close($ch);
    if ($data === false) 
      return false;
    if (preg_match('/Content-Length: (\d+)/', $data, $matches)) {
      return (float)$matches[1];
      }
    elseif (preg_match('/content-length: (\d+)/', $data, $matches)) {
      return (float)$matches[1];
      }
} 

I use it on lulzimg.com which is a very heavy traffic site with thousands of images uploaded everyday. And it IS very fast. If it's slow for you, maybe your server's on a congested network or the target urls are responding slow.