My specs:

3.8GHZ P4 w/HT, 512MB RAM, XP Media Center (Pro), and I'm using Limewire 4.0.8 (basic) & I'm connected to a lynksys wireless router.

I have a cable connection here's the results from a bandwidth test at http://www.bandwidthplace.com/speedtest/

Communications - 2.2 megabits per second
Storage - 273.8 kilobytes per second
1MB file download 3.7 seconds

I have my upload speed set to 270 kbps
maximum downloads = 29
upload slots = 3/3
disallow messages from 192.168.*.* & 10.*.*.*

NO matter what I download I can't get faster speeds than 30 kb/s and no more than 4 host at a time.
I've tried files with 4 stars and 52 hosts but the results are the same. I know its not my connect cause my average connection speed on SoulSeek is 80 kb/s