Thanks @Intasar,
I have a question if there is any (APC) opcode cache that really work with suPHP?
I have read few comments here http://wordpress.org/support
Server Version: Apache/2.2.27 (Unix) mod_ssl/2.2.27 OpenSSL/1.0.0-fips mod_bwlimited/1.4
CENTOS 6.4 x86_64 virtuozzo
Thanks