Does it happen after a fresh restart?

There's an application called Process Viewer in Applications/Utilities, it might be useful to run it and see how much memory is being swallowed by LimeWire (and your other applications). Try sorting by memory, then find an interesting process, select it, show "More Info" and take a look at the sizes shown in the "Statistics" tab.

From a fresh restart on my computer, LimeWire sits in 48MB (whoa!) resident on a computer with 1GB and 40MB on a computer with 384MB. Neither exhibit a large amount of paging.

It may not be memory-related at all, in fact. If you've got a large number of shared files that LimeWire needs to scan, your drive may be clanking away and your computer may seem sluggish - symptoms similar to those of excessive paging when memory is exhausted.

Mark
2.7.7/10.2.2