The default is 1 also because of netiquette - it's generally frowned upon by webmasters if someone uses more than 1 concurrent request, or makes requests too often (without any delay) - and quite often all requests from such sources get blocked at the firewall level - sometimes, even whole IP classes get blocked.So, t(h)read carefully ...
Web browsers have traditionally used connections at the same time, so that shoul be a reasonable number to use and one that shouldn't get you blocked.
