modperl / apache13 memory footprints on 32 adn 64 bit servers

Hello,

I'm in process of moving a mod_perl/apache1.3 application from 
32bit to 64bit architectures. I am not a sysadmin, but rather the app
programmer.  

But I'm surprised by the dramatic leap in httpd process sizes. Here are 
"typical" SIZE/RES figures:

32bit:  SIZE=45M   RES=32M
64bit:  SIZE=95M   RES=45M

Do these look reasonable? Should I worry?

Thanks to all who answer - your experience and expertise make mod_perl
a vital force.

Joe Niederberger