I couldn't find an "Activity Moniter" in utilities, or on my hard drive for that matter, but I did find a process viewer, and there was a "% Memory" so here are the results
LW= Around 34.40%, 35.00%
All processes total including LW= Around 67.63%

And my Computer Moniter stayed pretty high sometimes during limewire

I'll try out the beta

Thx