My experience agrees with this comment – I’m not sure why web browsers seem to frequently get hung up on only some Http requests at times, unrelated to the actual network conditions. Ie: in the browser the HTTP request is timing out or in a blocked state and hasn’t even reached the network layer when this occurs. (Not sure if I should be pointing the finger here at the browser or the underlying OS). However, when testing slow / stalled loading issues, this (the browser itself) is frequently one of the culprits- however, this issue I am referring to even further reinforces the article/sentiments on this HN thread (cut down on the number of requests / bloat, and this issue too can be avoided.)