Same problem here, Macbook Pro with

01:00.0 VGA compatible controller: nVidia Corporation GT216 [GeForce GT 330M] 
(rev a2) (prog-if 00 [VGA controller])
        Subsystem: Apple Computer Inc. Device 00c7
        Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- 
Stepping- SERR- FastB2B- DisINTx-
        Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- 
<MAbort- >SERR- <PERR- INTx-
        Latency: 0
        Interrupt: pin A routed to IRQ 16
        Region 0: Memory at c0000000 (32-bit, non-prefetchable) [size=16M]
        Region 1: Memory at 90000000 (64-bit, prefetchable) [size=256M]
        Region 3: Memory at a0000000 (64-bit, prefetchable) [size=32M]
        Region 5: I/O ports at 2000 [size=128]
        [virtual] Expansion ROM at c1000000 [disabled] [size=512K]
        Capabilities: <access denied>
        Kernel driver in use: nvidia
        Kernel modules: nvidia, nouveau, nvidiafb

It's really slow when I connect another monitor. It was slow with Natty,
too, but not at unusable like the new Ubuntu version. I have tried
different version of the Nvidia graphics driver without any success to
make it better.

I noticed that after plugging in the monitor compiz needs unusal long to
"recover".

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https://bugs.launchpad.net/bugs/877438

Title:
  Unity compiz plugin makes display slow on multi-screen

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