Nginx as general replacement for apache

==== ==== Required information ====
- iRedMail version: 0.8.3
- Store mail accounts in which backend (LDAP/MySQL/PGSQL): MySQL
- Linux/BSD distribution name and version: FreeBSD 9.1-RELEASE
- Related log if you're reporting an issue:
====

Hello,

I think most users run iRedMail on not very powerful hardware so RAM consumption and performance matter quite a lot.
As everybody you knows, Nginx outperforms Apache significantly (http://www.wikivs.com/wiki/Apache_vs_nginx)

So my question is: How you think about Nginx as an general replacement for Apache in iRedMail or as an alternative installation option like you also offer for the DBMS (MySql or PostgreSQL)?

Thank you,

jokibear