Are sockets so slow in PHP?

Question

I'm using this code for sockets. Console says that the page is processed for a very small amount of time, but Chrome says that page is loading for ~1 second!

    $this->serv_sock = socket_create(AF_INET, SOCK_STREAM, 0); 

 socket_bind($this->serv_sock, $this->serv, $this->port) or die("Could not bind to address\n");

 socket_listen($this->serv_sock);

 while (1) {
  echo "Waiting...\n";  
  $client = socket_accept($this->serv_sock); 

  $start_mtime = microtime(true);

  echo "Accepted at ".$start_mtime.".\n";

  $input = '';

  $len = 0;

  do {
   //echo "Reading.\n";
   $inp = socket_read($client, 1024);
   $input .= $inp;

   if (strpos($input, "\n\n") === false && strpos($input, "\r\n\r\n") === false)
    continue;

   if (!$len) {
    if (!preg_match("/Content-Length: (\d+)/", $input, $matches)) {
     break;
    }
    $len = $matches[1];
    if (!$len)
     break;
    echo "We want $len bytes.\n";
   }

   if (strpos($input, "\n\n") !== false)
    list($headers, $content) = explode("\n\n", $input);
   else 
    list($headers, $content) = explode("\r\n\r\n", $input);

   if (strlen($content) >= $len)
    break;
  } while ($inp);

  echo "Calling callback as ".microtime(true).".\n";

  if (strpos($input, "\n\n") !== false)
   list($headers, $content) = explode("\n\n", $input);
  else 
   list($headers, $content) = explode("\r\n\r\n", $input);

  $output = $this->translate($callback, $headers, $content); // nothing slow here

  $time_end = microtime(true);
  echo "Sending output at ".$time_end." (total ".($time_end - $start_mtime).")\n\n";

  $output = "HTTP/1.0 Ok\n".
  "Content-Type: text/html; charset=utf-8\n".
  "Content-Length: ".strlen($output)."\n".
  "Connection: close\n\n".
  $output;

  socket_write($client, $output);

  socket_close($client);
 }