Internet Explorer concurrent connection limit ()

Because ie complies with strict standards, as can only download two files concurrently, probably because of bandwidth or a large number of small files, other browsers do not seem to have this limit, there are many small resources in the game, some of which are packaged and some need to be loaded in real time. Although only two resources can be downloaded at the same time, the concurrency tested is faster than the queue download speed when a large number of resources are downloaded, however, concurrent downloads sometimes stop for no reason and do not throw events. You can perform a time-out process or not support the same resource. In this way, the download speed can be ensured, and resources can be dispersed and accelerated.

Internet Explorer and connection limits
Http://blogs.msdn.com/ie/archive/2005/04/11/407189.aspx

Modify connection limits
Http://support.microsoft.com/kb/183110

Queue download:
Bulkloader: http://code.google.com/p/bulk-loader/
Queueloader: http://code.google.com/p/queueloaderas3