Nginx isn't as fast as i expect

[somebody nobody]

i have tested nginx and apache with the "ab" tool. This is my results:

Apache:
   Requests per second:    6058.62 [#/sec]


Nginx:
   Requests per second:    1170.02 [#/sec]

this is my nginx.conf:

@@@@@

user  nobody nogroup;
worker_processes  10;

error_log  logs/error.log;
pid        logs/nginx.pid;

events {
    worker_connections  512;
    use eventport; #sol 10+
}


http {
    include       conf/mime.types;
    default_type  application/octet-stream;

    log_format  main  '$remote_addr - $remote_user [$time_local] $request '
                      '"$status" $body_bytes_sent "$http_referer" '
                      '"$http_user_agent" "$http_x_forwarded_for"';

    access_log  logs/access.log  main;

    sendfile        off;
    tcp_nopush on;
    tcp_nodelay on;
    keepalive_timeout  65;

    #gzip  on;

    root /home/mywebsite;
    index index.php;

    client_max_body_size    128k;
    client_body_buffer_size 128k;

    server {
        listen       80;
        server_name  www.mywebsite.com;

        #access_log off;

    #
    # PHP
    #

        location / {
            client_max_body_size    128k;
            client_body_buffer_size 128k;

            root   /home/mywebsite;
            index  index.php index.html;
        }

        location ~ \.php$ {
            include /nginx/conf/fcgi.conf;
            fastcgi_pass unix:/tmp/fastcgi.socket;
            fastcgi_index index.php;
        }


        error_page  404              /404.html;

        location /404.html {
            root /home/mywebsite;
            charset on;
        }

What can i do more to make it faster ??
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