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[Bug 1511258] [NEW] Unity/compiz has sluggish performance on dual monitors with nvidia driver


Public bug reported:

When Unity/Compiz is running with the nvidia driver and two monitors are connected the performance drops significantly.
This is probably related with https://bugs.launchpad.net/ubuntu/+source/nvidia-graphics-drivers/+bug/877438
This is still happening on ubuntu 15.10 with  the  nvidia  340.93 driver  (gtx 260)

notice how rezising windows makes the ui freeze and lag
moving windows arround lags compared to the mouse movement
the scale animation has a delay, and poor fps
this all goes away when the unity compiz plugin is disabled.

Disabling "Sync to VBlank" appears not to help.
The nouveau driver on the same hardware typically does not have the performance issue (but may have other issues such as stability, rendering it not a valid workaround).

Let me know If I can provide any additional information or help to fix this issue.
This has been happening for every ubuntu release, and I hoped to be fixed by now 

video showing the problem https://www.youtube.com/watch?v=Fbi6ih6Ry60

** Affects: compiz (Ubuntu)
     Importance: Undecided
         Status: New

** Tags: compiz nvidia

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  Unity/compiz has sluggish performance on dual monitors with nvidia

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