卷曲功能在godaddy上花费了太多时间

we have upgraded php version 5.3 to 5.4 on godaddy's web hosting. Everything works perfect but CURL functions not executing, if use any of CURL function it takes too much time and whole website stops working for that moment.

while these functions work properly in 5.3, but i dont get why it is taking so much time yet not working. following code making whole website stops working

$ch = curl_init("http://sub.example.com/page.php");
    curl_setopt($ch, CURLOPT_HEADER, 0);
    curl_setopt($ch, CURLOPT_HTTPGET, true);
    curl_exec($ch);
    curl_close($ch);