If I read it right, it makes multiple connections to the server.
A point worth noting, the maximum number of concurrent connections to a server used to be 8, but it was reduced to 2 (in theory 1 downloading and the other requesting) because the higher number caused traffic problems for some servers and other problems for ISPs. This is a general internet convention which is supposed to be observed by all browsers.
I suspect this patch simply raises the limit, so it doesn't matter what sort of connection you've got, but you are unlikely to notice much benefit if you've got a slow connection.
BTW, it really works.

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