I tested 275.09.07 with compiz, gnome-shell and xfwm4 - the problem is still there: gtkperf running about 4 seconds with xfwm4 and 30 - 35 seconds with compiz or gnome-shell. Also even without compositing smooth scrolling in gtk browsers(tested with Firefox and Chromium) works very poorly. In Opera smooth scrolling works fine even with compositing enabled.
Upd: with nouveau smooth scrolling works fine in all browsers.
Just in case I will attach nvidia-bug-report.log.
Cairo version - 1.10.2
Compiz version - 0.8.8
Gnome shell - 3.0.2