Cpanel Nginx Conf. Use at your own risk.

cpanel-nginx.conf

user  nobody;

# you must set worker processes based on your CPU cores, nginx does not benefit from setting more than that
worker_processes 2;

# number of file descriptors used for nginx
# the limit for the maximum FDs on the server is usually set by the OS.
# if you don't set FD's then OS settings will be used which is by default 2000
worker_rlimit_nofile 100000;

# only log critical errors
error_log  /var/log/nginx/error.log crit;

# provides the configuration file context in which the directives that affect connection processing are specified.
events {
    # determines how much clients will be served per worker
    # max clients = worker_connections * worker_processes
    # max clients is also limited by the number of socket connections available on the system (~64k)
    worker_connections 5120;

    # optmized to serve many clients with each thread, essential for linux
    use epoll;

    # accept as many connections as possible, may flood worker connections if set too low
    multi_accept on;
}

http {
    server_name_in_redirect off;
    server_names_hash_max_size 10240;
    server_names_hash_bucket_size 1024;
    include    mime.types;
    default_type  application/octet-stream;
    server_tokens off;

    # cache informations about FDs, frequently accessed files
    # can boost performance, but you need to test those values
    open_file_cache max=200000 inactive=20s; 
    open_file_cache_valid 30s; 
    open_file_cache_min_uses 2;
    open_file_cache_errors on;

    # to boost IO on HDD we can disable access logs
    access_log off;

    # copies data between one FD and other from within the kernel
    # faster then read() + write()
    sendfile on;

    # send headers in one peace, its better then sending them one by one 
    tcp_nopush on;

    # don't buffer data sent, good for small data bursts in real time
    tcp_nodelay on;

    # server will close connection after this time
    keepalive_timeout 30;

    # number of requests client can make over keep-alive -- for testing
    keepalive_requests 100000;

    # allow the server to close connection on non responding client, this will free up memory
    reset_timedout_connection on;

    # request timed out -- default 60
    client_body_timeout 10;

    # if client stop responding, free up memory -- default 60
    send_timeout 2;

    # remove/commentout disable_symlinks if_not_owner;if you get Permission denied error
    # disable_symlinks if_not_owner;
    gzip on;
    gzip_vary on;
    gzip_disable "MSIE [1-6]\.";
    gzip_http_version 1.1;
    gzip_min_length  10240;
    gzip_proxied expired no-cache no-store private auth;
    gzip_comp_level  6;
    gzip_buffers  16 8k;

    # You can remove image/png image/x-icon image/gif image/jpeg if you have slow CPU
    gzip_types    text/plain text/xml text/css application/x-javascript application/xml image/png image/x-icon image/gif image/jpeg application/javascript application/xml+rss text/javascript application/atom+xml;
    ignore_invalid_headers on;
    client_header_timeout  3m;
    connection_pool_size  256;
    client_header_buffer_size 256k;
    large_client_header_buffers 4 256k;
    client_max_body_size 200M; 
    client_body_buffer_size 128k;
    request_pool_size  32k;
    output_buffers   4 32k;
    postpone_output  1460;
    proxy_temp_path  /tmp/nginx_proxy/;
    proxy_cache_path /var/cache/nginx levels=1:2 keys_zone=microcache:5m max_size=1000m;
    client_body_in_file_only on;
    log_format bytes_log "$msec $bytes_sent .";
    log_format custom_microcache '$remote_addr - $remote_user [$time_local] '
        '"$request" $status $body_bytes_sent '
        '"$http_referer" "$http_user_agent" nocache:$no_cache';
    include "/etc/nginx/vhosts/*";
}