AWS Cloudfront looking for DNS again and again for same URL/Domain

On our website I found that server is looking for DNS again and again for subdomains. Like in the below screenshot static0.domain.com is getting looked up for DNS resolve 3 times(pink bar) and same for the case for static1 and static2. Ideally it should not look for the DNS again if its already found. Because of this website response time is getting delayed.

Please help me on this. Testing URL: http://ift.tt/1tk7BeZ

We are using amazon servers with cloudfront.