[attachment=547][attachment=547]Test result: http://www.webpagetest.org/result/151229_N1_a5b8a120781be2a76ce534b93099e8e6/1/details/
The 13th request http://www.mca.gov.in/MCA21/ appears to be an XHR request (XMLHttpRequest). This appears to block the other requests. Similarly request 21 is also an XHR request.
Google Chrome Developer Tool (Network View) shows the content type of these requests as XHR, but webpagetest is showing it as HTML.
Why does XHR appear to block further request? This behaviour is not observed in Developer Tools (refer attachment).