I recently noticed that all of the websites I oversee have gone down in rating tremendously over the period of one week. I have not made changes to those sites, but for some reason the ratings (mostly for YSlow) have gone down! I had optimized my more important sites to have ratings in the 92%–96% and they've all gone down below the 90% mark now.
Can you tell me if something has changed in the way sites are being rated now? When I look at a comparison of all the specific points that could all be optimized in YSlow, there's absolutely no difference in last weeks report compared to this week's report, but for some reason the ratings all have still gone down.
Thanks for the help!