How to limit resources available to xenforo

[warp0ut]

Hello,
I have dedicated linux server with 3 gameservers running and xenforo. When people start browsing forums gameservers lags. So my question is how can i limit system resources available to xenforo(nginx, php, etc), 1 gig of ram and 30% cpu maximum for example. Here are my phpinfo and nginx config. Other webserver related config files left with default settings.
Could you please advise me how to solve this issue? Moving xenforo to a separate server/hosting is not possible at the moment. Excuse me for my engrish. Thanks!

server {
  listen 80;
  server_name mydomain.com;
  rewrite ^(.*)$ http://www.mydomain.com$1 permanent;
}
server {
  listen 80;
  server_name www.mydomain.com;      # your domain name WITH www.
  access_log /var/log/nginx/mydomain.com.access.log;
  error_log /var/log/nginx/mydomain.com.error.log;
  root /var/www;

  location ~ /\.ht { deny  all; }      # Anything starting with .ht gets denied
  location  =/htaccess.txt {  deny all;  }

  location ~* \.(bmp|tiff|tga|jpg|jpeg|gif|png|ico|css|zip|tgz|gz|rar|bz2|doc|xls|exe|pdf|ppt|txt|tar|wav|bmp|rtf|js|7z|tar|lzma)$ {      # serve all these static files without hitting the php processor
  root  /var/www;      # you dont have to be explicit about this but incase you need to proxy stuff to another server this static stuff will still go through nginx
  expires max;
    }

  location =/admin.php {
      auth_basic            "Restricted";
      auth_basic_user_file  /var/.htpasswd;
              include        fastcgi_params;
              fastcgi_pass  127.0.0.1:9000;
              fastcgi_param  SCRIPT_FILENAME  $document_root$fastcgi_script_name;
              include /etc/nginx/fastcgi_params;
                      }

  location / {
    root  /var/www;  # absolute path to your installation
    try_files  $uri $uri/ /index.php?$uri&$args;
    index index.html index.php index.htm;
    location ~* ^.*\.php$ {
      include        fastcgi_params;
        fastcgi_pass  127.0.0.1:9000;
        fastcgi_index  index.php;
        fastcgi_param  SCRIPT_FILENAME  $document_root$fastcgi_script_name;
        include /etc/nginx/fastcgi_params;
      }
  }
}

 

[Slavik]

I would suggest you have a configuration problem opposed to a resource usage one. Xenforo is exceptionally low impact on any server setup and there should be no reason why it would cause your game server / consoles to lag.