I want to imporve drupal website performance. Already did settings for drupal cache & Advanced CSS/JS Aggregation. Also implemented the changes requested by gtmatix still it takes 20 seconds to load. Also implemented fastcgi cache but no improvement. Below is my nginx.conf settings:

user www-data;
worker_processes auto;
pid /run/nginx.pid;

events {
worker_connections 768;
}

http {

client_max_body_size 24M;

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

include /etc/nginx/mime.types;
default_type application/octet-stream;

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

gzip on;
gzip_disable "msie6";
gzip_vary on;
gzip_proxied any;
gzip_comp_level 6;
gzip_types text/plain text/css text/xml application/json application/javascript application/xml+rss application/atom+xml image/svg+xml;

fastcgi_cache_path /etc/nginx-cache levels=1:2 keys_zone=microcache:5m max_size=1000m;
log_format cache '$remote_addr - $remote_user [$time_local] "$request" '
'$status $upstream_cache_status $body_bytes_sent "$http_referer" '
'"$http_user_agent" "$http_x_forwarded_for"';

include /etc/nginx/conf.d/*.conf;
include /etc/nginx/sites-enabled/*;
}


Below is the site configuration:

server {
root /var/www/vhosts/www.example.com.cn/public_html;
index index.php index.html index.htm;
server_name www.example.com.cn;
access_log off;
error_log /var/www/vhosts/www.example.com.cn/log/www.example.com.cn.error.log;

location = /favicon.ico {
log_not_found off;
access_log off;
}
location = /robots.txt {
allow all;
log_not_found off;
access_log off;
}
location ~ /\.ht {
deny all;
}
location ~ \..*/.*\.php$ {
return 403;
}
location ~ ^/sites/.*/private/ {
return 403;
}
location ~ ^/sites/[^/]+/files/.*\.php$ {
deny all;
}
location ~ (^|/)\. {
return 403;
}
location / {
try_files $uri /index.php?$query_string; # For Drupal >= 7
}
location @rewrite {
rewrite ^/(.*)$ /index.php?q=$1;
}
location ~ \.php$ {
# Setup var defaults
set $no_cache "";
# If non GET/HEAD, don't cache & mark user as uncacheable for 1 second via cookie
if ($request_method !~ ^(GET|HEAD)$) {
set $no_cache "1";
}
# Drop no cache cookie if need be
# (for some reason, add_header fails if included in prior if-block)
if ($no_cache = "1") {
add_header Set-Cookie "_mcnc=1; Max-Age=2; Path=/";
add_header X-Microcachable "0";
}
# Bypass cache if no-cache cookie is set
if ($http_cookie ~* "_mcnc") {
set $no_cache "1";
}
# Bypass cache if flag is set
fastcgi_no_cache $no_cache;
#fastcgi_cache_bypass $no_cache;
fastcgi_cache microcache;
fastcgi_cache_key $server_name|$request_uri;
fastcgi_cache_valid 404 30m;
fastcgi_cache_valid 200 301 302 10m;
fastcgi_max_temp_file_size 1M;
fastcgi_cache_use_stale updating;
fastcgi_pass_header Set-Cookie;
fastcgi_pass_header Cookie;
fastcgi_ignore_headers Cache-Control Expires Set-Cookie;
fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name;

#proxy_cache_use_stale updating error timeout http_500 http_502 http_503 http_504;
fastcgi_cache_revalidate on;
#fastcgi_cache_background_update on;

fastcgi_param PATH_INFO $fastcgi_path_info;
#fastcgi_param PATH_TRANSLATED $document_root$fastcgi_path_info;
include fastcgi_params;

include snippets/fastcgi-php.conf;
fastcgi_pass unix:/run/php/php7.0-fpm.sock;
}
location ~ ^/sites/.*/files/styles/ { # For Drupal >= 7
try_files $uri @rewrite;
}
location ~ ^(/[a-z\-]+)?/system/files/ { # For Drupal >= 7
try_files $uri /index.php?$query_string;
}
location ~* \.(jpg|js|css|jpeg|gif|png|ico|cur|gz|svg|svgz|mp4|ogg|ogv|webm|htc|pdf|woff|woff2|ttf)$ {
try_files $uri @rewrite;
expires max;
log_not_found off;
access_log off;
add_header 'Access-Control-Allow-Origin' '*';
}
location ~ ^/sites/default/files/(?:css|js) {
gzip_static on;
access_log off;
expires max;
}
}