Rewrite Rules - impact if too many???

Hi,

We currently have about 30 Rewrite rules in our httpd.conf for one of our three virtual host.  The Web Infrastructure group is concerned that having too many of these will impact performance.  Is this true?  If so, how do you determine how many is too many?

I'm looking for information that will allow us to determine if we should or should not be using these rewrite rules - as we want/need to add more if it isn't going to impact site performance.  I would also be interested in hearing from those who use large numbers of these rules.

Below is a list of what we currently have.

Thanks,

Lisa

*** LIST ***
     RewriteEngine on

     #Rewrite Rules
     RewriteRule /professionalrecruiting http://www.MyWebSite.com/recruiting_home.html [NC]
     RewriteRule /staffing http://www.MyWebSite.com/staffing_home.html [NC]
     RewriteRule /humancapitalconsulting http://www.MyWebSite.com/hrc_home.html [NC]
     RewriteRule /technology/uk1 http://www.MyWebSite.com/technology/uk1.html [NC]
     RewriteRule /technology$ http://www.MyWebSite.com/technology_home.html [NC]
     RewriteRule /assessment http://www.MyWebSite.com/hrc_solutions_assessment.html [NC]
     RewriteRule /legal http://www.MyWebSite.com/recruiting_services_legal.html [NC]
     RewriteRule /outsourcing http://www.MyWebSite.com/outsrc_home.html [NC]
     RewriteRule /extranet/(.*) http://www4.MyWebSite.com/extranet/$1 [NC]
     RewriteRule /webmail http://webmail.MyWebSite.com [NC]
     RewriteRule /benefitpresentation http://www.MyWebSite.com/selfdirected.html [NC]
     RewriteRule /intranet http://intranet.MyWebSite.com [NC]
     RewriteRule /community/(.*) http://www4.MyWebSite.com/community/$1 [NC]
     RewriteRule /nl http://www4.MyWebSite.com/nl [NC]
     RewriteRule /custom/icc http://www4.MyWebSite.com/custom/icc [NC]
     RewriteRule /terms.cfm http://www.MyWebSite.com/corporate_termsofuse.html [NC]
     RewriteRule /copyright.cfm http://www4.MyWebSite.com/copyright.cfm [NC]
     RewriteCond %{HTTP_HOST} www.MyWebSiteprofessionalrecruiting.com
     RewriteRule (.*)$ http://www.MyWebSite.com/recruiting_home.html
     RewriteCond %{HTTP_HOST} www.MyWebSiteoutsourcing.com
     RewriteRule (.*)$ http://www.MyWebSite.com/outsrc_home.html
     RewriteCond %{HTTP_HOST} www.MyWebSitestaffing.com
     RewriteRule (.*)$ http://www.MyWebSite.com/staffing_home.html
     RewriteCond %{HTTP_HOST} www.MyWebSitehumancapitalconsulting.com
     RewriteRule (.*)$ http://www.MyWebSite.com/hrc_home.html
     RewriteCond %{HTTP_HOST} www.MyWebSitetechnology.com
     RewriteRule (.*)$ http://www.MyWebSite.com/technology_home.html
     RewriteCond %{HTTP_HOST} ^([^.]+)\.staffing\.MyWebSite\.com$
     RewriteRule ^(.+) %{HTTP_HOST}$1 [C]
     RewriteRule ^([^.]+)\.staffing\.MyWebSite\.com http://www.MyWebSite.com/OfficeLocator/$1.html
     RewriteRule /leads http://www.MyWebSiteleads.com [NC]
     RewriteRule /guaranteed http://www.MyWebSite.com/hrc_outplacement.html [NC]
     RewriteRule /wedeliver http://www.MyWebSite.com/staffing_callsource.html [NC]