Page load time is a very small factor for website ranking, but this could be done :
Regroup CSS in a single file, same for javascripts. Make a CSS sprite for the background images.
Add expires and gzip in your htaccess file if you can :
<ifmodule expires_module="">ExpiresActive On
ExpiresDefault "access"
ExpiresByType text/javascript "access plus 1 year"
ExpiresByType application/javascript "access plus 1 year"
ExpiresByType application/x-javascript "access plus 1 year"
ExpiresByType text/css "access plus 1 year"
ExpiresByType image/gif "access plus 1 year"
ExpiresByType image/jpg "access plus 1 year"
ExpiresByType image/jpeg "access plus 1 year"
ExpiresByType image/png "access plus 1 year"
ExpiresByType image/bmp "access plus 1 year"
ExpiresByType image/ico "modification plus 1 year"
ExpiresByType image/vnd.microsoft.icon "modification plus 1 year"
ExpiresByType application/ico "modification plus 1 year"
ExpiresByType image/icon "modification plus 1 year"
ExpiresByType image/x-icon "modification plus 1 year"</ifmodule>
<ifmodule deflate_module="">AddOutputFilterByType DEFLATE text/php text/html text/txt text/javascript text/css application/javascript application/x-javascript</ifmodule>