One of main thing for all web sites is content caching to improve site performance. Here are few examples how You can achieve this. Set this cache expiration example, which I am using on my content delivery network (CDN) server ME2J.com.
<FilesMatch ".(jpg|png|gif)$"> ExpiresDefault A0 Header set Cache-Control "max-age=0, no-cache, must-revalidate" </FilesMatch>
Which mean, that expiration date is in access moment and set headers to 0 values. As You can see, here You can add more filetypes for static content
This example can also speed-up Your webpage just with few lines of code by setting longer expiration time:
Where A is access time and 2592000=60*60*24*30 or one month.