External monitor lag with W530 and K2000M

Hi all. I have a W530 connected to my NEC PA241W by DisplayPort. Whenever I use 'extend' mode, I get mouse lag on second screen. It only happens when there's a window on screen, eg a browser window, PDF, Word document. When there's nothing there, no lag. It also only happens in 'extend' mode, and only on the external display. There's no lag on the laptop display, and no lag when I'm running the external display alone.
I'm using a K2000M with the nVidia 310.34 drivers. I'm currently on Windows 8 but this was also happening on Windows 7 with older nVidia drivers. I'm in Optimus mode. I haven't changed any rendering settings, so I assume all the relevant windows are being rendered by the integrated GPU.
Any help would be greatly appreciated!
EDIT: I've just tried this on another display connected by DisplayPort as well and have the same problem, so it's not the monitor.
EDIT #2: I've just performed a full reset of the laptop from within Windows 8 (basically reformat and reinstall) with stock video drivers and the issue is still there. However, if I boot into discrete graphics mode, everything works fine. Maybe this suggests the issue is with the Intel graphics or Optimus?

Syllogistic wrote:
Sorry, yes, by 'stock video drivers' in my second edit I meant the Lenovo driver package. I did a complete reinstall of Win 8 installing the latest Lenovo video driver package and the lag was there immediately. The only other things I had installed were the other Lenovo drivers at that stage.
I've since upgraded the NVidia driver to 310.34 (doing a clean install over the old NVidia driver) and the lag is still there.
Ok thanks. If you are using Lenovo drivers then it is obviously for them to resolve. I took the Windows 7 route with the T430s I just ordered to avoid the early adopter pain.

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