Here are my tests results:
In find the first DNS resolve time pretty long (according to my inexperienced judgment) and that probably explains the Grade D
If I run the test against the www version, then I get grade A or sometimes B.
The permanent redirection from non-www to www is done in the vhost file of my Apache server. I did something like that:
other directives to process www.domainname.com[/[/code]code]
Could someone provide me with a hint to improve the non-www version ?