Internet Performance Hit Using BitTorrent with a Linksys Router

I have a LinkSys WRT54G V2.2. I noticed when I'm using a Bit Torrent client with about 6 incoming and 6 outgoing connections that my internet performance goes down significantly. During this time I would be using about 150KB per second downstream and about 30KB per sec upstream. I know I have plenty of downstream bandwidth available but it appears that the router is choking on all the simultaneous connections being used by the Bit Torrent client.
Using the speed tests provided by www.dslreports.com I test my connection before using Bit Torrent and have about 600KB per sec downstream and about 60KB per sec upstream. After running the Bit Torrent client with about a half dozen connections incoming and out going using only 150KB downstream and 30KB upstream the speed test shows that I only have about 50KB downstream throughput and only about 6KB upstream throughput. It doesn't make sense that only that small amount of bandwidth is available when I'm not even using nearly that much.
I also tried the same test with a couple large downloads via HTTP, and my bandwidth shows the performance hit that I expect taking into account the actual bandwidth that I'm using.
Can anyone shed some light on what is going on here.

If you're utilizing BitTorrent I assume you're using Azureus or a similar client for your connections? Either way, by nature, BitTorrent files are transmitted via multiple connections over a wide span of users. Even if you arn't downloading your full bandwidth's worth, your client is continuously scanning for more connections to increase the speed at which your transfers are running. The numbers may add up to much less than your bandwidth, but there's quite a lot of background work that those clients are doing and not listing for you in a display. Even if that utilizes half of your bandwidth, 1/2 is quite a bit. I have the same issue, and have resulted in just using my torrents while I sleep or am at work.

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