12.10 / nouveau driver+nvidia+dualmonitors-setup newbie / need briefing :)

[Tobias k1fri]

hi folks,

as you (hopefully) know i've been helping test ubuntu flavours for a 
while. now since about a week, i've got, in my private working 
environment, a dualmonitor setup running on 12.10 / nouveau driver + 
nvidia GeForce 7600 GT dating from 2006 (which on 12.04 was running on 
the closed sourced driver / single monitor).

since i've got this setup the experience is, well, not so nice! my 
system never crashes, but it's sluggish and gives me very high cpu-usage 
when opening/removing/resizing windows and such as. also the graphics 
adapters temperature is constantly at a very high level (no matter what 
i do).

i had a check a couple of days ago - most of the features of my graphics 
adapter are not supported by nouveau.

so my first question: is there any point in sticking with the nouveau 
driver?
and second would be: if so, what can i do to improve the experience (as 
my system never ever crashes) ?
and third: if this is the wrong place to ask, where else could i do?

thanks for your advice
beste grüße
tobias