Set HTTP Cache Headers
<VirtualHost *:80>
# Your config...
ExpiresActive On
<FilesMatch "\.(ico|gif|jpe?g|png|js|css)$">
ExpiresDefault "access plus 1 year"
Header unset ETag
FileETag None
Header unset Last-Modified
</FilesMatch>
</VirtualHost>
Gzip Web Server Output
<VirtualHost *:80>
# Your config...
AddOutputFilterByType DEFLATE text/html text/plain text/xml application/xml application/xhtml+xml text/javascript text/css application/x-javascript
BrowserMatch ^Mozilla/4 gzip-only-text/html
BrowserMatch ^Mozilla/4\.0[678] no-gzip
BrowserMatch \\bMSIE !no-gzip !gzip-only-text/html
</VirtualHost>
Source: Faster Sites Done Faster
Further reading: Using a far future expires header