If you have LW Pro with a cable/dsl connection, you'll be able to download from 10 hosts. If you have a T3 connection, the max is 14. The numbers of hosts that you can connect to has been set so that everyone (regardless of their connection) can use the network successfully...otherwise there could be heaps of network congestion & endless queueing for files.

Apart from your connection speed & the connection speed of the hosts that you're downloading from, your download speed also depends on your ISP. If your ISP is throttling p2p bandwidth, you're never going to see blazing downloads. Try downloading outside of peak hours & see whether your speed improves. You can also use google to see if your ISP is known to throttle bandwidth...look for your ISP name throttling p2p or your ISP name traffic shaping.

You really need to give some details if you want more help...talking about your ISP package, modem/router is a bit meaningless if we don't know who/what you're talking about
System details - help us to help you -> Provide these details when you post!!!(click on link)

You could also do a speed test & tell us the result.
Speedtest.net - The Global Broadband Speed Test

Torrent files are a bit different, the only time that you'll see files downloading from 20-30 hosts (or more) is if you're downloading a torrent file. But even with torrents, some files can be slow slow even when downloading from heaps of hosts.
Have a look through the links below for hints about optimising LW's performance & info about torrents. If you want to be able to download torrent files with LW, you'll need to be using a LW version 4.13 or later (the latest stable release is 4.14.12).

A few things to consider while configuring Limewire for optimal performance...

How do you use the new feature on Limewire?(Torrents)

BitTorrent - Wikipedia, the free encyclopedia

Beginners Guide