It doesn't have anything to do with Flex, its IE. IE 6 and I believe
7, and Firefox 2 all default to only allow 2 downloads from a single
subdomain. I got that from the folks at Yahoo that bring us the YSlow
stuff. If you are using an Apache front end you could make your
request to multiple subdomains, e.g. data1.yourdomain.com and
data2.yourdomain.com would let you go to 4, conversely if you have
control of all the computers hitting your service there are registry
tweaks you can set, something along the lines of
max_server_connections, that's from memory so don't take it as
doctrine. I've also read that IE 8 beta defaults to something like 30.
I'm using Firefox 3 and set it to 30, as well as allowed it to use
http pipelining, up to 30 requests per socket, and things seem to just
scream!!
Good luck
Mike