You can enable cache in cPnginx. This will decrease the server load. But enabling cache will show the  website updates slowly only. To enable cache please do the following,

1) Modify the file /etc/cpnginx/vhost.conf as follows,

• client_max_body_size 10m;
• client_body_buffer_size 128k;
• proxy_send_timeout   90;
• proxy_read_timeout   90;
• proxy_buffer_size    4k;
• proxy_buffers     16 32k;
• proxy_busy_buffers_size 64k;
• proxy_temp_file_write_size 64k;
• proxy_connect_timeout 30s;
• proxy_cache my-cache;
• proxy_cache_valid  200 302  60m;
• proxy_cache_valid  404      1m;
• proxy_cache_key “$scheme$host$request_uri”;

2) Edit nginx.conf as follows,

• # cPanel Nginx Master configuration
• user  nobody;
• error_log  logs/error.log;
• #Number of worker you need
• worker_processes  5;
• # How many connections a worker can handle maximum.
• events {
• worker_connections  1024;
• }
• http {
• include    mime.types;
• default_type  application/octet-stream;
• sendfile on;
• server_names_hash_max_size 5000;
• server_names_hash_bucket_size 128;
• client_header_buffer_size 16k;
• large_client_header_buffers 16 16k;
• tcp_nopush on;
• tcp_nodelay on;
• keepalive_timeout  0;
• gzip on;
• gzip_min_length  1100;
• gzip_buffers  4 32k;
• gzip_types    text/plain  application/x-javascript text/xml text/css;
• ignore_invalid_headers on;
• client_header_timeout  3m;
• client_body_timeout 3m;
• send_timeout     3m;
• proxy_cache_path   /usr/local/nginx/proxy_cache   levels=1:2 keys_zone=my-cache:8m max_size=1000m inactive=600m;
• proxy_temp_path    /usr/local/nginx/proxy_temp ;
• include “/usr/local/nginx/conf/vhost.conf”;
• include “/etc/cpnginx/cpanelproxy.conf”;
• }