How to avoid freeing memory on exit?

[Roy Smith]

I've got a program which builds a very complex data structure consisting 
of about 200,000 objects.  When the program exits, the top-level object 
goes out of scope, and the interpreter grovels about for a long time 
freeing up the individual elements of the data structure.  This takes a 
while.

Is there any way to get the interpreter to just exit without doing all 
that memory cleanup?  Once the results have been printed, I don't care 
if memory is kept in a consistant state, since the very next thing I'm 
going to do is blow away the process.