https://bugzilla.mozilla.org/show_bug.cgi?id=423377 just got filed and 
has traction.

Axel

Sylvain Pasche wrote:
> Hi,
> 
> I saw recently that IE 8 increased their number of downloads per 
> hostname from 2 to 6 [1]. Out of curiosity, I wrote a small testcase [2] 
> to measure what is the default settings in other browsers. The test 
> measures how many persistent connections are opened in parallel to a 
> given server:
> 
> Firefox 2: 2
> Firefox 3: 2
> Opera 9.26: 4
> Opera 9.5 beta: 4
> Safari 3.0.4 Mac/Windows: 4
> IE 7: 2
> IE 8: 6
> 
> So apparently Firefox will have the smallest default value in the latest 
> major browser versions once IE 8 is out.
> 
> The real question would be to know if raising that default value is 
> worth it from the user experience point of view.
> 
> On the other hand, the HTTP RFC recommends only 2 simultaneous 
> connections per server, but as Steve Souders points out: "... the spec 
> was written in 1999. Today’s clients and servers can support more 
> parallel downloads"
> 
> Sylvain
> 
> [1] http://www.stevesouders.com/blog/2008/03/10/ie8-speeds-things-up/
> [2] http://www.spasche.net/files/parallel_connections/
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