Why my web server memory utilization is very high?

Sol 1:
Use sttaic IP's instead of wildcard IP's(*).

virtualhostIP.conf (in this file don't use wildcard character)

uses less memory 
<virtualHost 10.62.55.11:80>
<virtualHost 10.62.55.11:443>

Uses More memory

<virtualHost *:80>
<virtualHost *:443>


listenIPs.conf (in this file don't use wildcard character)


uses less memory 
<listen 10.62.55.11:80>
<listen 10.62.55.11:443>

Uses More memory

<listen *:80>
<listen *:443>

Sol 2:

Comment unnecessary modules in you httpd.conf file

 if not using perl comment it
if not using CGI comment it