Add Cache-Control Headers in your root .htaccess file

By adding cache control header into your .htaccess file, it can be possible to speed up your website.
Here is the way  how to add Cache-Control Headers in your root .htaccess file

# 480 weeks
<FilesMatch ".(ico|pdf|flv|jpg|jpeg|png|gif|js|css|swf)$">
Header set Cache-Control "max-age=290304000, public"
</FilesMatch>

# 2 DAYS
<FilesMatch ".(xml|txt)$">
Header set Cache-Control "max-age=172800, public, must-revalidate"
</FilesMatch>

# 2 HOURS
<FilesMatch ".(html|htm)$">
Header set Cache-Control "max-age=7200, must-revalidate"
</FilesMatch>

Explanation: The first portion of the code will cache your .ico, .jpg, .png, .css, .js, .swf file for 480 days. You can change this 480 days by your one by changing red color portion
480weeks= 480*7*24*60*60=290304000