Which are the apache modules which are not required by Drupal?

Hey,
Am running my site, www.ngopost.org, and I do see that each apache process takes about 75MB, which I think is very high. Most forums say that the apache process should not take more than 15-30MB.

I guess the problem is that lot of my modules in apache are enabled, here is the list,

alias.conf authz_default.load cgi.load dir.load mime.load php5.load ssl.conf
alias.load authz_groupfile.load deflate.conf env.load negotiation.conf rewrite.load ssl.load
auth_basic.load authz_host.load deflate.load include.load negotiation.load setenvif.conf status.conf
authn_file.load authz_user.load dir.conf mime.conf php5.conf setenvif.load status.load

Can someone give me some hint on some of the above which can be disabled?