my wordpress site goes very slow

The three files that are taking up to 20 seconds to load are the following:

/wp-content/themes/salient/css/responsive.css.php
/wp-content/themes/salient/css/colors.css.php
/wp-content/themes/salient/css/custom.css.php

Where did you get this theme and why is it generating CSS using PHP? Did the site load time increase after switching to this theme?

If you understand PHP code open these files and check if they’re making HTTP requests to any remote URLs.

You also need to enable gzip compression and set expires header. But they don’t provide a significant boost as of now with these files taking a lot of time: I believe you’re using Nginx so edit the virtual host file of the domain and add the following inside the server {...} block.

	gzip on;
	gzip_disable "msie6";

	gzip_vary on;
	gzip_proxied any;
	gzip_comp_level 6;
	gzip_buffers 16 8k;
	gzip_http_version 1.1;
	gzip_types text/plain text/css application/json application/x-javascript text/xml application/xml application/xml+rss text/javascript;

	location ~* .(ogg|ogv|svg|svgz|eot|otf|woff|mp4|ttf|css|rss|atom|js|jpg|jpeg|gif|png|ico|zip|tgz|gz|rar|bz2|doc|xls|exe|ppt|tar|mid|midi|wav|bmp|rtf)$ {
               expires max; log_not_found off; access_log off;
	}

Hi !
I have a tips for all the people how have slow wordpress, install VARNISH !!! :) this is the how to UBUNTU server:

• sudo curl http://repo.varnish-cache.org/debian/GPG-key.txt | sudo apt-key add -
• sudo nano /etc/apt/sources.list
• deb http://repo.varnish-cache.org/ubuntu/ lucid varnish-3.0
• sudo apt-get update
• sudo apt-get install varnish
• sudo service apache2 restart
• sudo service varnish restart

THAT’S IT ! It work really well and now your website open in 1-2 sec
VARNISH IS AMAZING !!! :D no need to use a non working good CACHE plugins ;)

Nickthevoice