Breezy/X.org/nVidia poor performance

[Chris]

I'm using the exact same kernel, X.org config, and nVidia drivers in
both Hoary and Breezy yet the performance is really bad in Breezy.  I
can actually see the login screen being redrawn and when using
applications I can see the windows being drawn and such.  Right clicking
on the desktop has like a 2 second delay before the window pops up.

Any ideas on what might cause this?  My configuration is identical for
all the parts I can think of, the only difference being one install is
Hoary and the other Breezy.

It seems like I have seen this problem before but I absolutely can not
remember what the issue is.

Thanks for any help

-- 
// Chris