I've done a clean install of Ubuntu 64-bit and tested only with the free
Nouveau driver with the following result:

With Unity:
Sign well until login screen. No flickering, screen freezes and perfect 
transparency.

When I open the Dash, the screen flashes. With "Shut Down" window as
well. With thunderbird when browsing folders, the screen is frozen and
unresponsive, having to restart after, etc ...

Metacity:
All Ok so far.

Compiz:

Several problems, but I have to keep trying

I have to say that my problems with the Nvidia driver start with the
first version of Ubuntu with Unity and have been getting worse with each
version so far.

With version 14.04 and 14.10 with Nouveau same problems and with Nvidia
Driver only frozen window with LibreOffice Calc (not always).

RAM memory consumption increased with Unity and less with Compiz

** Attachment added: "Unity Sesion"
   
https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/1448938/+attachment/4393286/+files/IMG_20150506_005618.jpg

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Title:
  Nvidia

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