LW allows you to control/limit the speed by which you let others to download (tools>options>Uploads>basic).
The chances are, whoever from whom you were downloading was limiting the speed, or maybe he/she had multiple clients downloading at the same time. You can't always control/predict the actual download speed, and as for this, it's not the software's problem. It's the server's.

Oh, and while I'm on the subject; just because it says "T3" on the results window, it doesn't always means it's true. Some users register less honestly (e.g. says "modem" when actually its "T3" in order to attract too many downloaders). You can't judge the book by the colour of the cover...