How can I improve the TTFB?

I was having a very large (500-1500ms) TTFB with nginx, wordpress, PHP 7 (php-fpm), and SSL. This was not the case on non-PHP sites, so it was safe to assume that PHP and SSL each could use some tuning.

2 things got me great improvement (<100ms TTFB):

1. Enable http2 in all of my SSL server blocks (needs nginx 1.9.5+)

   server {
     listen 443 ssl http2;
     #rest of your config here
   }
   

2. Set up fastcgi_cache

   In /etc/nginx/nginx.conf:

   fastcgi_cache_path /etc/nginx-cache levels=1:2 keys_zone=phpcache:100m inactive=60m;
   fastcgi_cache_key "$scheme$request_method$host$request_uri";
   

   In your server’s .conf file likely in /etc/nginx/conf.d/ modify the php handling block

   location ~ [^/]\.php(/|$) {
   fastcgi_cache phpcache; # The name of the cache key-zone to use
   fastcgi_cache_valid 200 30m; # What to cache: 'Code 200' responses, for half an hour
   fastcgi_cache_methods GET HEAD; # What to cache: only GET and HEAD requests (not POST)
   add_header X-Fastcgi-Cache $upstream_cache_status; # Add header so we can see if the cache hits or misses
   
   # the rest of your existing stuff to handle PHP files here
   }
   

3. restart nginx sudo nginx -s reload

This reduced my TTFB to under 100ms consistently, and everything seems to be pretty happy :)

setting up fastcgi_cache did a good job of shortening ttfb

OP right TTFB are very important but people don’t read between the lines I have website Google lower it rank after I move it to another host TTFB was horrible and alot of page failure load . In fact even VPS provider cheating about real resource you get Pleas read this

“” Also, be wary of virtual or “on-demand” hosting systems. These systems will suspend or pause your virtual server if you have not received traffic for a certain period of time. Then, when a new user accesses your site, they will initiate a “resume” activity to spin that server back up for processing. Depending on the provider, this initial resume could take 10 or more seconds to complete. If that first user is the Google search bot, your TTFB metric from that request could be truly awful. “”

http://moz.com/blog/improving-search-rank-by-optimizing-your-time-to-first-byte I think the only solution is using Low End Decided Server Or Xen VPS As it are Hardware Virtualization