[Trisquel-users] Lagging graphics after upgrading to Trisquel 7

[webmaster]

I have upgraded to Trisquel 7, but the graphics is lagging when I move  
windows, using menus and play games. I have compiz installed, but not sure if  
it's activated. I tried to type 'compiz --replace' in the terminal, but that  
just removes all window borders and stuff + I have tried to change visual  
effects in the compiz settings manager, just to check if they work, but they  
doesn't.

Do I need to install other packages? (I have a NVIDIA card)