use cache look add install html minfty and use cache bro

http {

        add_header rt-Fastcgi-Cache $upstream_cache_status;
        fastcgi_param HTTP_IF_NONE_MATCH $http_if_none_match;
        fastcgi_param HTTP_IF_MODIFIED_SINCE $http_if_modified_since;

        ##
        # Basic Settings
        ##

        sendfile on;
        tcp_nopush on;
        tcp_nodelay on;
        keepalive_timeout 65;
        types_hash_max_size 2048;

        # server_names_hash_bucket_size 64;
        # server_name_in_redirect off;

        include /etc/nginx/mime.types;

        default_type application/octet-stream;
        ##
        # Logging Settings
        ##

        access_log /var/log/nginx/access.log;
        error_log /var/log/nginx/error.log;

        ##
        # Gzip Settings
        ##

        gzip on;
        gzip_disable "msie6";

        server_tokens off;
        gzip_vary on;
        gzip_proxied any;
        gzip_comp_level 6;
        gzip_buffers 16 8k;
        gzip_http_version 1.1;
        gzip_min_length 256;
        gzip_types text/plain text/css application/json application/x-javascript text/xml application/xml application/xml+rss text/javascript application/ld+json application/vnd.ms-fontobject application/x-font-opentype application/x-font-truetype application/x-font-tt$
        gzip_disable "MSIE [1-6]\.";
        #set client body size to 2M #
        client_max_body_size 20M;
        ##
        # nginx-naxsi config
        ##
        # Uncomment it if you installed nginx-naxsi
        ##
        include /etc/nginx/naxsi_core.rules;

add this in default config

location ~*  \.(jpg|jpeg|png|gif|ico|css|js|svg|woff|pdf|html|htm)$ {
                expires max;

        }
 }

This may solve it.

I installed memcached

HowTos:
i install these packages:

sudo apt-get install memcached php5-memcached

then do

sudo service nginx restart

memcached is already preconfigured

then install a Wordpress plugin:
[https://wordpress.org/plugins/memcached/](http://)
Or use one from the keyword in plugin list “memcached” in the search

memcached stores the cache in ram. So lower cpu usage for you.