Slow Computer performance when running LW4.10.0

[TryHard]

Hi first post on here, so bear with me

I upgraded to LW4.10.0 recently, and have noticed massive slowdown on my comp when running it.
I checked in Task Manager, and it seems that LW wants to take up 90%+ of my CPU, and well over 50Mb of memory...

Given that my computer is an Athlon64 2800+, with a gig of RAM, I though this a little odd...
(rest of specs FYI; Win XPsp2, Asus K8N, Radeon 9800Pro, Audigy2, latest drivers/updates for all)

So, did a bit of researching on here, and found these threads.
http://www.gnutellaforums.com/showth...ystem+slowdown
http://www.gnutellaforums.com/showth...threadid=50201
http://www.gnutellaforums.com/showth...threadid=36420

And followed the advice in them;

Cleared the download queue (even though I only had 9 active downloads), and also played around with the preferences from the fifth post in the first link. No difference.
checked java, already had v5u6
deleted the .limewire folder (remembering my settings), no difference (even after letting it load all my files again).
tried setting the priority of LW to belowNormal and Low in task manager, no noticeable affect.

Final thing I tried was to remove both the Java and LW installs from the computer, download the offline installers, and reinstall Java first, then Limewire.
(as suggested in the 2nd link)

Guess what, that appeared to have done the trick. Limwire is now using a more respectable 24% of CPU (although Mem is up at 70mb now...), and my computer was back to running nice and smoothly

Bet you thought the problem had been cracked right... wrong

In the space of 10mins with limewire open, it has all gone back to as before! Argh nightmare!

Any more sugestions?

Thanks in advance
Ed