Here are some tips to improve your site's YSlow grade:
- Turn off Etag.
Just add the following code to your .htaccess file:
FileETag None
- Add an Expires header to your web component.
To add an expires header to images, stylesheets, scripts, Flash, just add the following code to your .htaccess file:
<IfModule mod_expires.c> ExpiresActive On ExpiresDefault A600 ExpiresByType image/x-icon A2592000 ExpiresByType application/x-javascript A604800 ExpiresByType text/css A604800 ExpiresByType image/gif A2592000 ExpiresByType image/png A2592000 ExpiresByType image/jpeg A2592000 ExpiresByType text/plain A86400 ExpiresByType application/x-shockwave-flash A2592000 ExpiresByType video/x-flv A2592000 ExpiresByType application/pdf A2592000 ExpiresByType text/html A600 </IfModule>
# The following list can help you to convert common time intervals into seconds:
# 300 = 5 minutes
# 2700 = 45 minutes
# 3600 = 1 hour
# 54000 = 15 hours
# 86400 = 1 day
# 518400 = 6 days
# 604800 = 1 week
# 1814400 = 3 weeks
# 2419200 = 1 month
# 26611200 = 11 months
# 29030400 = 1 year = never expires
This need apache has installed mod_expires. - Make fewer HTTP requests
You can use Joomla Plugin: CssJsCompress to aggregate all JavaScript and CSS files into one file, and use inline image combine all CSS images into a single image file.