AFJSONRequestOperation delay in response
 Requests with AFNetworking:

      NSOperationQueue *queue = [[NSOperationQueue alloc] init];
        [queue setMaxConcurrentOperationCount:1];
        [queue addOperation:request1];
        [queue addOperation:request2];

The request1 gets its response immediately after calling it.
But second request2 receives response with 14 or 16 seconds delay after calling it.

Server log shows that the request2 went there with 14-16 seconds delay from client time. and it responds immediately. so server should be right.

What it could be? 

AFJSONRequestOperation delay in response
===

 Requests with AFNetworking:

      NSOperationQueue *queue = [[NSOperationQueue alloc] init];
        [queue setMaxConcurrentOperationCount:1];
        [queue addOperation:request1];
        [queue addOperation:request2];

The request1 gets its response immediately after calling it.
But second request2 receives response with 14 or 16 seconds delay after calling it.

Server log shows that the request2 went there with 14-16 seconds delay from client time. and it responds immediately. so server should be right.

What it could be? 
