If I open up Chrome devtools and go to the Network panel and then do a ctrl+F5 of my website, I notice a pattern each time.
The first request, to a php page, has a latency (waiting) time of 74ms. pinging my server takes 35ms, so I'm reasonably happy that the overhead of finding and serving a php page is only 40ms or so.
But then as the page goes on to load assets, most of them take ~200ms. Static jpegs/css/js etc.
Is this "normal", if so what's the reasoning for it?
If I browse directly to an image (so I'm loading just a jpeg and nothing else) then my latency for that request tends to be in the 60-70ms range.
I'm serving the site over SPDY, but disabling that doesn't seem to make any difference
This is my nginx.conf file:
pid /var/run/nginx.pid;
user nginx nginx;
worker_processes 6;
error_log /var/log/nginx/error.log;
events {
use epoll;
worker_connections 1024;
}
http {
server_tokens off;
client_max_body_size 50m;
ssl_session_cache shared:SSL:10m;
ssl_session_timeout 20m;
ssl_protocols TLSv1 TLSv1.1 TLSv1.2;
ssl_ciphers "ECDHE-RSA-AES256-GCM-SHA384:ECDHE-RSA-AES128-GCM-SHA256:DHE-RSA-AES256-GCM-SHA384:DHE-RSA-AES128-GCM-SHA256:ECDHE-RSA-AES256-SHA384:ECDHE-RSA-AES128-SHA256:ECDHE-RSA-AES256-SHA:ECDHE-RSA-AES128-SHA:DHE-RSA-AES256-SHA256:DHE-RSA-AES128-SHA256:DHE-RSA-AES256-SHA:DHE-RSA-AES128-SHA:ECDHE-RSA-DES-CBC3-SHA:EDH-RSA-DES-CBC3-SHA:AES256-GCM-SHA384:AES128-GCM-SHA256:AES256-SHA256:AES128-SHA256:AES256-SHA:AES128-SHA:DES-CBC3-SHA:HIGH:!aNULL:!eNULL:!EXPORT:!DES:!MD5:!PSK:!RC4";
ssl_prefer_server_ciphers on;
ssl_certificate /etc/pki/tls/certs/ssl-bundle.crt;
ssl_certificate_key /etc/pki/tls/private/STAR_mydomain_com.key;
ssl_stapling on;
ssl_stapling_verify on;
ssl_dhparam /etc/ssl/certs/dhparam.pem;
charset utf-8;
source_charset utf-8;
include /etc/nginx/mime.types;
default_type application/octet-stream;
log_format main '$https $remote_addr - $remote_user [$time_local] "$request" '
'$status $body_bytes_sent $bytes_sent "$http_referer" '
'"$http_user_agent" "$http_x_forwarded_for"';
access_log /var/log/nginx/access.log main;
sendfile on;
keepalive_timeout 75s;
keepalive_requests 100;
open_file_cache max=100;
etag off;
gzip on;
gzip_http_version 1.1;
gzip_comp_level 1;
gzip_static on;
gzip_types text/plain text/css application/json
application/x-javascript text/xml application/xml
application/xml+rss text/javascript image/svg+xml
application/vnd.ms-fontobject application/x-font-ttf
font/opentype;
index index.php index.html;
fastcgi_read_timeout 600s;
include /etc/nginx/sites-enabled/*.conf;
include /etc/nginx/conf.d/*.conf;
}
nginx version:
nginx version: nginx/1.6.2
built by gcc 4.4.7 20120313 (Red Hat 4.4.7-3) (GCC)
TLS SNI support enabled
configure arguments: --prefix=/etc/nginx --sbin-path=/usr/sbin/nginx
--conf-path=/etc/nginx/nginx.conf --error-log-path=/var/log/nginx/error.log
--http-log-path=/var/log/nginx/access.log --pid-path=/var/run/nginx.pid
--lock-path=/var/run/nginx.lock
--http-client-body-temp-path=/var/cache/nginx/client_temp
--http-proxy-temp-path=/var/cache/nginx/proxy_temp
--http-fastcgi-temp-path=/var/cache/nginx/fastcgi_temp
--http-uwsgi-temp-path=/var/cache/nginx/uwsgi_temp
--http-scgi-temp-path=/var/cache/nginx/scgi_temp --user=nginx
--group=nginx --with-http_ssl_module --with-http_realip_module
--with-http_addition_module --with-http_sub_module --with-http_dav_module
--with-http_flv_module --with-http_mp4_module --with-http_gunzip_module
--with-http_gzip_static_module --with-http_random_index_module
--with-http_secure_link_module --with-http_stub_status_module
--with-http_auth_request_module --with-mail --with-mail_ssl_module
--with-file-aio --with-ipv6 --with-http_spdy_module
--with-cc-opt='-O2 -g -pipe -Wp,-D_FORTIFY_SOURCE=2 -fexceptions
-fstack-protector --param=ssp-buffer-size=4 -m64 -mtune=generic'
Devtools waterfall:
