I have recently started using Limewire and i'm having a similar problem. Sometimes it works fine, but other times u load it up and everything responds very slowly! You click on things and they take about 5 seconds to respond. Also when you minimize Limewire and bring it back up again, only half the display comes back, its as if the computer is running slow! But all other programs work fine.

Once you finally get something to download the download speed seems fine.