There are not 93 open connections but 93 connections in total. Without using HTTP-Keepalive on Serverside each Browser-to-JDownloader request will open a new TCP connection which will end up in normal WAITING state. Those states don't hurd and any OS (incuding Windows) doesn't care for normal use.
Quote:
On Windows platforms, the default timeout is 120 seconds, and the maximum number of ports is approximately 4,000, resulting in a maximum rate of 33 connections per second
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I don't see any advantage for HTTP-Keepalive in localhost/lan situation where latency is no requirement nor problem.