Hello - As soon as I log in, my dual core CPU spikes at 100%, and stays there. This happens with the current official SL Viewer, Phoenix, Firestorm, even the old Nicholaz viewer. If I pull up a small window in front of SL (such as GPU-Z or Cacheman), where I can still see SL messages and monitor my FPS and bandwidth, I see my CPU drop to 'normal' - but as long as SL is the 'active' window, it is spiked at 100%, and SL lags to 2-4fps. This began just over a week ago, and I had made no changes to my system. I have found several articles in the knowledge base concerning lowering the graphic and other settings, disabling threaded optmization, etc, which I did do. I have run MemTest, tested my CPU, swapped out my GPUs, with no difference in this condition. I have 2 bootable HDDs on this computer, one running WinXP-64 and the other running WinXP-32, and this occurs in both set-ups. I have done a fresh install of WinXP64, and run SL before I installed ANYTHING else (antivirus, etc) and this *still* occurred. Today I pulled my RAM, and put in one stick at a time, and swapped each of them out to see if any single one of them caused it (no). All of my other applications (even the graphic intensive ones, like PoserPro) are running normally. I don't play any games, so I cannot say whether Half-life or CoD or any other would do the same. Specs: Intel Pentium D dual core 3GHz 4GB DDR2 800 RAM Windows Pro XP64 nVidia GeForce 8500 GT (x2, SLI enabled) 650w PSU I've spent the past 9 or 10 days beating my head against the wall on this one, pulling out and reseating, cleaning components. Does anyone have any ideas, or similar past issues, and how they solved it? Thank you, ~ Dream