"You realize that googlebot makes multiple (we counted up to 11) GET requests in one single TCP/IP connection [... ] these multiple GET requests in the some TCP/IP connection are processed in sequence (one after the other).

If one these GET requests has a major time lag (is much slower than the other GET requests) Google cuts the TCP/IP connection. Because all the GET requests in the connection were processed in sequence, all the GET requests after the cut are lost."

Read more: http://www.free-seo-news.com/newsletter442.htm#facts#ixzz12iZon1Du