I have the same problem, but since version 2.7.9. It is not always 100%, but most of the time I cannot run other software with LimeWire, it eats up all the resources.

Also, after a day or two of running, the Search\Download window freezes. The Size, Status, Progress, Speed, Time columns don't get updated, they show the same info. If I add new downloads, their detials are empty. This is the same for the Connections\Connected Host, and Monitor\Upload. I can search, and add new searches, and the download is working as the files get updated in the Incomplete folder, if I look in that.

Windows XP 2600
IE6 SP1 + MS Virtual Java Machine
LimeWire 2.7.13

Supermicro 370SSa, PentiumIII 600, 256 MB, IBM 60 GB.