I have this problem in the version 2011 64bit, (but also in the 2010!).
I have a excel 2007 and win 7 64 ultimate
all access at the toolbox function are very slow..
for insert in assemblig a part, necessary waiting about 30/40 seconds( in this time all is frozen)
for set different options of the parts, necessary waiting other 30 seconds for each set.
I try to install a new cleaning operating system and the all other software( like a new computer) but not solved the problem.
I try install sw 2011 in my notebook, and all work perfectly!!
Where is the problems?