Hello.
I am still struggling with mouse lags in Windows 8. They went away for a week or two and just a few days ago they started up again.
My core parking has been disabled since the first time this happened a couple weeks ago, I'm not running folding at all, and Process Lasso does not show any significant CPU usage for any of the 12 cores when this is happening. Really, there is NOTHING I can point my finger (or mouse) at.
It almost seems like it may be a graphic problem because the behavior is like "Drunken Mouse", the cursor lags way behind the mouse movements on the screen, and if you happen to have a grip on something (an open window or icon you might be dragging or resizing), the mouse lags will cause you to unintentionally "let go" of whatever it is you have, and possibly "grab" or launch something else from the desktop.
My mouse is a Microsoft cordless mouse (the one that is flat and you bend it to turn it on and use it), with the little tranceiver plugged into a USB 2.0 port on the back of the motherboard. The case is still on the workbench, with no USB hubs or devices plugged in other than a USB keyboard, this mouse, and a PS2 keyboard. It even happens when no software is opened yet.
It happens infrequently, like not even every hour, and (as far as I can tell), not at the same time of day. Maybe a couple times in a 4 to 6 hour window of usage. It lasts for no more than 30 seconds or so and does not produce any overt messages or dialogs.
I do not have Bitlocker or any other disk encryption facility installed and I do not yet have any backup software or automated tasks running.
The only things I am running in the background are Windows Defender (as it comes with Windows 8 from the factory), Diskeeper 12 30-day trial, Asus AI Suite (motherboard monitoring), and Corsair Link (also monitors motherboard stuff), although the last time it happened, I hadn't yet launched Corsair link.
It is very difficult to pin this one down because the lag does not happen at any predictable time, nor does it happen when I'm running a specific app or tool. Sometimes it just happens right when I arrive at my desktop, at other times when I'm browsing the web with Firefox, and still other times when I am looking at my folder structures with the File Manager.
I wish there were a way for me to take a checkpoint of what's running or in memory when this happens. And again when the problem goes away.