It’s taken me a year but I’ve done it. The only thing missing – that elusive 9% – is a CDN. But I’m not going to have that so I now have the highest rating I can achieve.
Once this site is at its new host, I’ll start looking at the same thing (restrictions on the .htaccess file, amongst other things, prevents me at the moment).
To put this in perspective, Amazon.co.uk and Apple.com both have a score of 63%, Microsoft.com a score of 94% and PC Pro a score of 52%. Google, not surprisingly, scores 99%. What is surprising, though, is that Yahoo – the people who originated this scoring system – gets 82%.