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["Sven K." <776198@xxxxxxxxxxxxxxxxxx>]

I had very similar problems with unity (latest ubuntu 11.04) + nvidia
(latest driver from the official repositories). The PC is a "Foxconn
NetBox-nT330i Nettop" (Intel Atom 330 with NVIDIA ION chipset) with two
monitors (TwinView 2x1920x1080):

As soon as I open a terminal, or kile, etc. the Xorg process rises up to
100% CPU power, which slows down all processing, e.g., typing needs
about 50-500 ms after each keypress, dragging&dropping a maximized
window from one monitor to the others laggs a lot, and so on. The system
was near to be unuseable. So, I gave it a last try:

The Intel Atom 330 provides 64bit instructions, but I had a 32bit ubuntu
installed. Today, I installed ubuntu 11.04 64bit. And now all works as
it should (and as it was before with older 32 bit ubuntus)! No more
typing delay, and no more Xorg process raising to 100% CPU power. The
system responses very fast! So, at least on my PC, this problem seems to
be somehow related to 32/64 bit combinations of CPU, ubuntu and perhaps
the nvidia driver (due to 3D-requesting unity).

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which is subscribed to nvidia-graphics-drivers in Ubuntu.
https://bugs.launchpad.net/bugs/776198

Title:
  xorg and nvidia give very bad performance on multi display setup after
  update to ubuntu 11.04

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