Hi,
i'm trying to install Nginx to replace Apache on several Virtuzzo VPS. I'm experiencing a big performance problem. On the same server and on static files when acting as a reverse proxy, Apache is able to serve something like 10mbps, Nginx stops at 100-200kbps. This is the configuration:

worker_processes 1;

events {
worker_connections 1024;
}

server {
listen 81;
server_name test.domain.com;

location / {
proxy_set_header X-Real-IP $remote_addr;
proxy_set_header Host www.domain.com;
proxy_pass http://IP_ADDR_ORIGIN;
proxy_store /var/www/cache/www.domain.com$uri;
proxy_store_access user:rw group:rw all:r;
}
}

No problem if it doesn't act as reverse proxy; at the same time Apache with the same origin server doesn't have any problem. Also Nginx doens't have any problem in a similar server based on Xen virtualization tecnology with exactly the same configuration.
May anyone help me?
Thanks for your support
Alex